Updated on 2022/07/02

写真a

 
MINO Michinobu
 
Organization
Institute of Global Human Resorce Development Professor
Position
Professor
External link

Degree

  • 学術博士 ( 岡山大学 )

Research Interests

  • Magnetic domain structure

  • chaos

  • Science education

  • Electron Spin Resonance

Research Areas

  • Natural Science / Mathematical physics and fundamental theory of condensed matter physics

  • Natural Science / Magnetism, superconductivity and strongly correlated systems

  • Humanities & Social Sciences / Science education

Education

  • Okayama University   大学院 自然科学研究科 博士課程   物質科学専攻

    - 1991.3

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    Country: Japan

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  • Okayama University   大学院 理学研究科 (修士課程)   物理学

    - 1987.3

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    Country: Japan

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  • Okayama University   理学部   物理学科

    - 1985.3

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    Country: Japan

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Research History

  • Okayama University   Institute of Global Human Resource Development   Professor

    2017

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  • Okayama University   Educational Center for Researchers of the Next Generation

    2014.10 - 2018.3

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  • Okayama University   自然科学研究科   Associate Professor

    2004 - 2017

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  • Okayama University   Faculty of Science   Associate Professor (as old post name)

    2001 - 2004

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  • Okayama University   Faculty of Science   Research Assistant

    1993 - 2001

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  • Kobe University   Faculty of Science

    1990 - 1991

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Professional Memberships

 

Papers

  • Chaotic motion of a magnetic domain structure under an alternating field

    Michinobu Mino, Yousuke Yamamoto

    JOURNAL OF THE KOREAN PHYSICAL SOCIETY   63 ( 3 )   605 - 607   2013.8

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:KOREAN PHYSICAL SOC  

    Magnetic domains in a garnet thin film under alternating magnetic fields up to 2000 Hz have been investigated at room temperature. Domain structures and motions have been observed. When the field frequency is low, the magnetization changes periodically, and the domain pattern has a labyrinth structure. When the amplitude and the driving frequency of the field are increased, irregular oscillations of the magnetization appear, and chaotic motions of the domain are observed. In this region, domain structures have a disk-like shape. These disks grow from some crystal defects, and a growing point shows a branch-like form.

    DOI: 10.3938/jkps.63.605

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  • Microwave radiation from parametrically excited YIG

    M. Mino, M. Tsukamoto, K. Fujikawa, Y. Ono

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   E549 - E551   2007.3

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    Microwave radiation from parametrically excited magnons was studied experimentally. Parallel pumping excitations were carried out on a ferromagnetic yttrium iron garnet (YIG). A high sensitivity microwave circuit was used to detect spectra of radiation microwave. At high pumping power, multi-frequency components are observed simultaneously. The spectra depend on static field, or magnetostatic modes. In order to characterize the timeseries of microwave radiation, a correlation dimension is estimated. These results show that a four-magnon scattering is important in a nonlinear relaxation process. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2006.10.606

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  • Magnetic domain patterns depending on the sweeping rate of magnetic fields

    Kazue Kudo, Michinobu Mino, Katsuhiro Nakamura

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   76 ( 1 )   013002   2007.1

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    The domain patterns in a thin ferromagnetic film are investigated in both experiments and numerical simulations. Magnetic domain patterns under a zero field are usually observed after an external magnetic field is removed. It is demonstrated that the characteristics of the domain patterns depend on the decreasing rate of the external field, although it can also depend on other factors. Our numerical simulations and experiments show the following properties of domain patterns: a sea-island structure appears when the field decreases rapidly from the saturating field to the zero field, while a labyrinth structure is observed for a slowly decreasing field. The mechanism of the dependence on the field sweeping rate is discussed in terms of the concepts of crystallization.

    DOI: 10.1143/JPSJ.76.013002

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  • Magnetic domain structure in thin film under alternate magnetic field

    M. Mino, H. Yamazaki

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   272   E509 - E510   2004.5

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    Magnetic domain structures in a garnet thin film under alternate magnetic fields have been investigated. In alternate magnetic fields, a labyrinth structure approaches a parallel-stripe structure. The competition among the segment clusters, in which stripes have different directions, causes stable dynamical domain structures. With the increase of the amplitude of alternate fields, the segment clusters become small. (C) 2004 Elsevier B. V. All rights reserved.

    DOI: 10.1016/j.jmmm.2003.12.1298

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  • Lattice anomaly and dynamics of CuGeO3

    M. Fujita, K.Ubukata, M.Arai, T.Tonegawa, M.Mino, M.Motokawa, K.Knight, B.Forsyth, S.M.Bennington, J.Akimitsu, O.Fujita

    Physica B   219-220   95   1996

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  • ANTIFERROMAGNETIC-RESONANCE AND SPIN-WAVE INSTABILITIES AT SPIN-FLOP CRITICAL-FIELD IN (C2H5NH3)2CUCL4 Reviewed

    J SHI, H YAMAZAKI, M MINO

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   57 ( 10 )   3580 - 3586   1988.10

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    Antiferromagnetic resonance and parametric excitation of spin-waves at spin-flop critical field in (C2H5NH3)2CuCl4 are studied by perpendicular-pumping technique. Nonlinear absorption which is attributed to the first-order Suhl instability is observed at twice the frequency of the spin-flop critical field resonance. Power dependence of the imaginary part of the susceptibility, χ″, shows the existence of the second threshold which indicates unstable growth of second group of magnon modes.

    DOI: 10.1143/JPSJ.57.3580

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  • Determination of molecular density distribution and formation of novel structure by SEM in mixed crystals of organic metals

    Kokichi Oshima, Michinobu Mino, Mishuku Kim

    PHYSICA B-CONDENSED MATTER   405 ( 11 )   S120 - S122   2010.6

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    The atomic distribution in organic conductors has been studied by SEM using EDX analysis It has been revealed that the distribution is affected by the electron bombardments substantially Small whiskers have been created by electron bombardments at some conditions We propose this effect as a technique to prepare a new system in organic materials using SEM/EDX apparatus (C) 2010 Elsevier B V All rights reserved

    DOI: 10.1016/j.physb.2009.12.082

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  • Direct estimation of zero-field energy gap in the nano-scale single molecular magnet V-15

    K. Kajiyoshi, T. Kambe, M. Mino, H. Nojiri, P. Koegerler, M. Luban

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   1203 - 1205   2007.3

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    The electron spin resonance (ESR) at low frequency (0.6-3 GHz) and at low temperature (-0.5 K) was performed for the single molecular magnet V-15. Non-linear field dependence of resonance at the lowest temperature implies the existence of the zero-field gap. The angle dependence of resonance field has strong anisotropy. We directly estimate the zero-field energy gap of 30 mK and analyze the energy levels using the model with Dzyaloshinskii-Moriya interaction. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2006.10.313

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  • Observation of the antiferromagnetic resonance of multi-sublattice modes in KCuF3

    QF Shi, LS Li, M Mino, Yamada, I, H Yamazaki

    PHYSICA B-CONDENSED MATTER   381 ( 1-2 )   271 - 273   2006.5

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    We report antiferromagnetic resonance measurements of KCuF3 at various frequencies from 3.8 to 10GHz at 4.2K. A second antiferromagnetic resonance absorption mode is observed in the [100](p) direction and equivalent directions, where [](p) represents an axis in a unit cell of the perovskite structure. Using the eight-sublattice model proposed by Yamada and Kato [J. Phys. Soc. Japan 63 (1994) 289], the numerical calculation for the antiferromagnetic resonance indicates that this second absorption mode comes from one of the resonance modes of the eight-sublattice system. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2006.01.496

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  • Experimental observation of the antiferromagnetic resonance linewidth in KCuF3

    L Li, Q Shi, M Mino, H Yamazaki, Yamada, I

    JOURNAL OF PHYSICS-CONDENSED MATTER   17 ( 17 )   2749 - 2754   2005.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP PUBLISHING LTD  

    We report the results of antiferromagnetic resonance (AFMR) measurements conducted on KCuF3 at various frequencies from 3.8 to 10.6 GHz at 4.2 K. The resonance linewidth is first found to depend on the frequency, i.e., the lower the frequency the greater the resonance linewidth, no matter whether the AFMR field is forced on the easy axis or uneasy axis. Moreover, a linewidth peak seems to exist for H 11 [100]p at about 4 GHz. Based on the model of Yamada and Kato (1994 J. Phys. Soc. Japan 63 289) and considering the Laudau-Lifshitz damping term, the result of numerical calculation for the resonance linewidth is in good agreement with the data of AFMR experiments.

    DOI: 10.1088/0953-8984/17/17/024

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  • Control of spin-wave instability threshold in YIG sphere

    M Mino, M Tsukamoto, M Yamazaki, H Yamazaki

    PHYSICA B-CONDENSED MATTER   329   1227 - 1228   2003.5

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    Spin-wave instability threshold under multiple drive excitations is studied in an yttrium iron garnet sphere at 4.2 K. Both a static magnetic field and a parallel RF field are applied along the [1 1 1] direction. Another perpendicular RF field excites magnetostatic modes through the first-order Suhl process. Interactions between spin-waves and magneostatic modes cause a change of instability thresholds. (C) 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(02)02162-2

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  • Relaxation time of parametrically excited magnetostatic modes in YIG

    M Tsukamoto, M Mino, H Yamazaki

    PHYSICA B-CONDENSED MATTER   329   1229 - 1230   2003.5

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    Parallel pumping experiments were conducted on a single-crystal yttrium iron garnet sphere. Microwave radiation from magnetostatic modes, which were parametrically excited through parallel pumped spin-waves, was studied experimentally at several temperatures. As excitation microwave power is turned off, it will be thought that microwave radiation decreases exponentially. Relaxation time of a magnetostatic mode, which is excited beyond thermal equilibrium level, is estimated by this method. (C) 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(02)02194-4

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  • Parametrically excited magnetoelastic waves in FeBO3

    K Ishihara, M Mino, M Tsukamoto, H Yamazaki

    EPR IN THE 21ST CENTURY: BASICS AND APPLICATIONS TO MATERIAL, LIFE AND EARTH SCIENCES   89 - 92   2002

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    Parametric excitation of magnetoelastic waves in the easy-plane antiferromagnet FeBO3 is studied at room temperature. Measurements were performed at X-band microwave with a perpendicular pumping configuration. As increasing the pumping power, the microwave absorption by a quasimagnon mode is saturated above the threshold level. Above this threshold, the number of quasiphonons with a half pumping frequency grows exponentially. The microwave radiation from these quasiphonons is simultaneously observed. Further increase of microwave power causes auto-oscillations in the magnetoelastic system. The radiation spectrum shows side band peaks around a half pumping frequency.

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  • Microwave radiation from magnetostatic mode in high power FMR

    M Mino, H Tsukuda, M Tsukamoto, H Yamazaki

    EPR IN THE 21ST CENTURY: BASICS AND APPLICATIONS TO MATERIAL, LIFE AND EARTH SCIENCES   85 - 88   2002

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    Microwave radiation from nonlinearly excited magnons in a ferromagnetic yttrium iron garnet (YIG) is studied. Experiments were carried out in the X-band range with a single crystal spherical YIG at liquid nitrogen temperature. Parametric resonance of magnons with a parallel punping configuration was employed. The spectrum of microwave radiation depends on a static field and the pumping power. At high pumping power, more than one frequency peak are observed simultaneously. These peaks correspond to magnetostatic modes.

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  • Relaxation of labyrinth domain structure of ferromagnetic thin film under field cycles

    S Miura, M Mino, H Yamazaki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   70 ( 10 )   2821 - 2824   2001.10

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    The relaxation of a two-dimensional labyrinth pattern of magnetic domain structure in a uniaxial garnet thin film is studied. The usually observed domains of the labyrinth structure contain many defects. The labyrinth structure changes to a parallel-stripe structure under magnetic field cycles. In this evolution, defects of the domain pattern disappear. We have introduced a number of magnetic domain junctions as characteristic values of a domain pattern. A magnetic domain junction is defined as a point where magnetic domains in the same direction intersect like a three-forked road. This is one type of defect in the domain pattern. It is found that the number of junctions decreases with the power law as a function of the number of ac magnetic field cycles.

    DOI: 10.1143/JPSJ.70.2821

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  • Strange attractor of controlled chaos in yttrium iron garnet films

    M Mino, PE Wigen

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   70 ( 7 )   2161 - 2163   2001.7

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    Parametrically excited spin waves in an yttrium iron garnet (YIG) are good model objects to study nonlinear dynamics. Chaotic oscillations of this system can be controlled with a time-delayed feedback method. The feedback perturbation was added to the static magnetic field. This controlling process has been characterized by strange attractors. With increasing feedback gain, a fractal dimension of the strange attractor decreases from 2.9 to 1.1. This means that chaotic oscillations change to periodic oscillations successively. Further increase of feedback gain eventually produces chaotic oscillations again.

    DOI: 10.1143/JPSJ.70.2161

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  • Relaxation of magnetic domain structure in garnet thin film under field cycles

    M Mino, S Miura, K Dohi, H Yamazaki

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   226   1530 - 1532   2001.5

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    A relaxation process of magnetic domain structure in a garnet thin film under field cycles have been investigated. Usually observed labyrinth structures contain many eddies. These labyrinth structures change to parallel-stripe structures under field cycles. In this evolution, eddy structures disappear. This process is evaluated by using a power spectrum analysis of the domain pattern. A number of magnetic domain junctions are introduced as another characteristic of complexity. These junctions are defined as a point, where magnetic domains with same direction intersect like a fork in the road. It is found that the number of junctions decrease with the power law as a function of the number of magnetic field cycles. (C) 2001 Elsevier Science B.V. All rights reserved.

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  • Half the pumping frequency radiation in YIG under the parallel pumping

    I.Kalinichenko, M.Mino and H.Yamazaki

    Proceedings of the Eighth International Conference on Ferrites   900 - 902   2001

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  • Microwave radiation of parametrically excited quasiphonons in antiferromagnet FeBO3

    QH Zwang, M Mino, VL Safonov, H Yamazaki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   69 ( 1 )   41 - 44   2000.1

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    Magnetic microwave parametric excitation of magnetoelastic waves in the easy-plane antiferromagnet FeBO3 is studied at room temperature. Measurements were performed at X-band with a perpendicular pumping configuration. We observed the saturation of the microwave absorption of antiferromagnetic resonance above the pumping threshold and simultaneous microwave radiation from the sample at half pump frequency. The radiation spectrum, its intensity dependence on the pumping power and magnetic field are investigated. The obtained results are in agreement with the fact that the radiation appears due to parametrically excited transverse quasiphonons propagating along the "hard" magnetic axis of a crystal.

    DOI: 10.1143/JPSJ.69.41

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  • The Onset of Auto-Oscillations of Parametrically Excited Spin-Wave Pairs

    Michinobu Mino, Hisayuki Urakami, Vladimir L. Safonov, Keiichi Zouta, Hitoshi Yamazaki

    Journal of the Physical Society of Japan   67 ( 2 )   409 - 412   1998.2

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    DOI: 10.1143/jpsj.67.409

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  • Unitary transformations in weakly nonideal Bose gases Reviewed

    Q. Shi, V. L. Safonov, M. Mino, H. Yamazaki

    Physics Letters, Section A: General, Atomic and Solid State Physics   238 ( 4-5 )   258 - 264   1998.2

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    We developed a method for constructing nonlinear unitary transformations in many-body systems. It is demonstrated how to eliminate the three-boson interaction terms which describe forbidden processes in one- and two-component Bose gases. The corresponding effective four-boson interaction amplitudes are calculated. © 1998 Published by Elsevier Science B.V.

    DOI: 10.1016/S0375-9601(97)00949-3

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  • Observation of Nonlinear Coupled Photon-Magnon Oscillations in YIG Reviewed

    Qingfan Shi, Michinobu Mino, Vladimir L. Safonov, Hitoshi Yamazaki

    Journal of the Physical Society of Japan   67 ( 9 )   3283 - 3287   1998

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    Nonequilibrium spin waves excited by the parallel pumping in an yttrium iron garnet placed in a microwave cavity was studied by means of additional weak microwave signal. The response of the probe signal represented a two-hump spectrum just above the threshold of parametric instability. It corresponds to mixed oscillations of photons and magnons and demonstrates that the parametric spin-wave pair behaves as a single-mode oscillator nonlinearly coupled with the electromagnetic mode of microwave cavity. We observed another splitting in the spectrum before the onset of auto-oscillations. It is assumed to indicate that this steady state of parametric system consists of two different parametric spin-wave pairs. Theoretical calculations which consider coupled systems of resonator mode and magnetic sample are found to be in good agreement with the experimental data.

    DOI: 10.1143/JPSJ.67.3283

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  • Parametric Pair of Waves as a Nonlinear Oscillator

    Safonov Vladimir, Shi Qingfan, Mino Michinobu, Yamazaki Hitoshi

    J Phys Soc Jpn   66 ( 7 )   1916 - 1919   1997.7

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    We considered the process of parametric excitation of spin waves andmagnetoelastic waves in magnetoordered crystals in a microwave resonator.From our analysis it follows that for the k and - k wave pairthere is a single-mode realization (i.e. the pair can be represented as oneoscillator). The theory of parametric resonance of waves constructedin terms of these collective variables provides a new perspective onsome old spin-wave experiments and helps explain the recently obtained experimental data.

    DOI: 10.1143/JPSJ.66.1916

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    Other Link: https://jlc.jst.go.jp/DN/JALC/00047792944?from=CiNii

  • Electromagnetic Emission by a System of Nonequilibrium Magnons in a Ferrite

    Taranenko Alexandr, Mino Michinobu, Yamazaki Hitoshi, Safonov Vladimir

    J Phys Soc Jpn   65 ( 12 )   4072 - 4075   1996.12

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    Spectra of electromagnetic emission of frequencies $\simeq \omega_{\rm i}$,2ω i and 3ω i, where ω i is the bottom ofthe spin-wave band have been studied in yttrium iron garnetat temperatures of liquid nitrogen and liquid helium.The spin-wave system was strongly excited by parallel pumpingwith microwaves of frequency ω p > 2 ω i.Line shapes and frequency shifts of the emission depend ontemperature, static magnetic field, pump power and time durationof the pump pulse. Discussion of obtained results is given.

    DOI: 10.1143/JPSJ.65.4072

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  • Quantum effect in the high-field phase of CsCuCl3

    M. Motokawa, M. Arai, M. Ohta, M. Mino, H. Tanaka, K. Ubukata

    Physica B: Condensed Matter   211 ( 1-4 )   199 - 204   1995.5

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    DOI: 10.1016/0921-4526(94)00985-5

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  • Neutron diffraction study of DyAg in high magnetic field

    M. Motokawa, M. Arai, M. Mino, K. Ubukata, T. Bokui, M. Fujita, P. Morin

    Journal of Magnetism and Magnetic Materials   140-144   1107 - 1108   1995.2

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    DOI: 10.1016/0304-8853(94)01004-8

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  • Structural evolution of spin-peierls material CuGeO studied by neutron scattering

    M.Arai, M.Fujita, K.Ubukata, H.Ohta, M.Motokawa, T.Otomo, K.Ohyama, M.Mino, J.Akimitsu and O.Fujita

    Journal of Magnetism and Magnetic Materials   140-144   1689   1995

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  • The Lattice evolution of the spin-Peierls material CuGeO3 studied by the neutron scattering

    M.Fujita, M.Arai, K.Ubukata, H.Ohta, M.Mino, M.Motokawa, K.Knight, R.Ibberson, J.B.Forsyth, S.M.Bennington, O.Akimitsu, J.Fujita

    Physica B   213-214   288   1995

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  • Magnetic structure of DyAg in high magnetic field studied by neutron diffraction 共著

    K.Ubukata, M.Arai, M.Fujita, M.Mino, T.Bokui, P.Morin, M.Motokawa

    Physica B   213-214   1022   1995

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  • Magnetic structure of DyAg in high magnetic fields

    K. Ubukata, T. Bokui, M. Arai, M. Mino, P. Morin, M. Motokawa

    Physica B: Condensed Matter   201   163 - 166   1994.7

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    DOI: 10.1016/0921-4526(94)91074-x

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  • Neutron diffraction of CsCuCl3 in high fields

    M. Mino, K. Ubukata, T. Bokui, M. Arai, H. Tanaka, M. Motokawa

    Physica B: Condensed Matter   201   213 - 216   1994.7

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    DOI: 10.1016/0921-4526(94)91086-3

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  • Neutron Scattering Studies on Spin-Peierls Material CuGeO3

    Masatoshi Arai, Masaki Fujita, Katsunori Ubukata, Takahiro Bokui, Kiyoshi Tabata, Hitoshi Ohta, Mitsuhiro Motokawa, Toshiya Otomo, Kenji Ohyama, Michinobu Mino, Jun Akimitsu, and Osamu Fujita

    Journal of the Physical Society of Japan   63 ( 5 )   1661 - 1665   1994

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    Crystal structure and phonon dynamics up to 150 meV of the spin-Peierls material CuGeO3 have been investigated by neutron scattering experiments. We found a large lattice anomaly in the a-b plane, vertical to the one-dimensional antiferromagnetic spin chain, associated with additional diffraction peaks in the b∗-axis at temperatures much higher than the spin-Peierls transition temperature. The phonon modes of the chain oxygens at 100 meV show consistent evolution with diffraction. Therefore, we conclude that the structural evolution of the chain oxygens in the a-b plane, which mediates the spin-spin interaction along the c-axis, drives the spin-Peierls transition. © 1994, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.

    DOI: 10.1143/JPSJ.63.1661

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  • Neutron Diffraction of CsCuCl3 and DyAg in High Magnetic Fields

    M. Motokawa, M. Arai, M. Mino, K. Ubukata, T. Bokui, M. Fuji

    KENS REPORT-X (KEK)   175   1994

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  • Relaxation measurements of flux pinning by a double pulsed field

    M. Motokawa, H. Nojiri, M. Mino, T. Bokui

    Physica B: Condensed Matter   184 ( 1-4 )   522 - 525   1993.2

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    DOI: 10.1016/0921-4526(93)90408-x

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  • Development and use of pulsed high magnetic fields for neutron diffraction experiments

    M.Motokawa, M.Arai, M.Mino, K.Ubukata, T.Bokui, M.Fujita

    Proceedings of the Twelfth Meeting of the International Collaboration Advanced Neutron Sources 24-28 May   1   260   1993

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  • Magnetic Phase Transition of CsCuCl in Pulsed Magnetic Field

    M.Mino, K.Ubukata, T.Bokui, M.Arai, H.Tanaka, M.Motokawa

    Proceedings of the Fifth International. Symposium on Advanced Nuclear Energy Research   416   1993

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  • Quasiperiodic and chaotic oscillations of magnon systems driven by modulated pumping field

    M.Mino, S.Mitsudo, H.Yamazaki

    Journal of Magnetism and Magnetic Materials   104-107,1055   1055   1992

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  • Influence of radiation damping on the threshold of auto-oscillations in YIG under parallel pumping

    H.Yamazaki, Y.Yunoki, M.Mino, S.Mitsudo, V.L.Safonov

    J.Magn.Magn.Mater.   104-107,1059   1059 - 1060   1992

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  • Period-doubling cascade and chaos in YIG at first-order Suhl instability

    S.Mitsudo, M.Mino, H.Yamazaki

    Journal of Magnefism and Magnetic Materials   104-107   1057 - 1058   1992

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  • Fractal Structure of Strange Attractor at the Subsidiary Resonance in Yttrium Iron Garnet

    Seitaro Mitsudo, Michinobu Mino, Hitoshi Yamazaki

    Journal of the Physical Society of Japan   59 ( 12 )   4231 - 4234   1990.12

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    DOI: 10.1143/jpsj.59.4231

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  • Transition to chaotic state in spin-wave turbulence

    M. Mino, S. Mitsudo, H. Yamazaki, K. Nakamura

    Journal of Magnetism and Magnetic Materials   90-91   781 - 782   1990.12

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    DOI: 10.1016/s0304-8853(10)80284-7

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  • STRANGE ATTRACTORS IN PARALLEL-PUMPED SPIN-WAVE INSTABILITIES - BIFURCATION OF MULTIFRACTALS

    M MINO, H YAMAZAKI, K NAKAMURA

    PHYSICAL REVIEW B   40 ( 7 )   5279 - 5281   1989.9

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    DOI: 10.1103/PhysRevB.40.5279

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  • CHAOS IN SPIN-WAVE INSTABILITIES - THEORY AND EXPERIMENTS

    H YAMAZAKI, M MINO

    PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT   98 ( 98 )   400 - 419   1989

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  • EXAFS study on fe-doped YBa2Cu3Oy

    Akihisa Koizumi, Hironobu Maeda, Naruhiko Bamba, Hiroshi Maruyama, Eiji Takayama-Muromachi, Jun Shi, Kazuaki Shimizu, Michinobu Mino, Hitoshi Yamazaki

    Japanese Journal of Applied Physics   28 ( 2 A )   L203 - L206   1989

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    An extended X-ray absorption fine structure (EXAFS) method was applied to YBa2Cu3-xFexOy with x=0.05, 0.1, 0.2, 0.3, 0.4 and 0.5. Fe atoms are surrounded by six oxygen atoms with a distance of about 1.85 Å, and they mainly substitute for the Cu(1) site over the whole concentration range. The local structures around Cu atoms and Y atoms are also reported. © 1989 The Japan Society of Applied Physics.

    DOI: 10.1143/JJAP.28.L203

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  • Parametric Excitation of Spin-Wave Through Spin-Flop Critical Field Resonance in (C2H5NH3)2CuCl4

    H.Yamazaki, J.Shi, M.Mino

    Journal de Physique   49 ( C8 )   1607   1988

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  • Multi-Fractals of Strange Attractors in Parallel-Pumped Spin-Wave Instabilities Reviewed

    K.Nakamura, M.Mino, H.Yamazaki

    Journal de Physique   49-C8,1599   1988

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  • Chaos and Strange Attractor of Parallel-Pumped Magnons in YIG

    H.Yamazaki and M.Mino

    Journal de Physique   49 ( C8 )   1609   1988

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  • Strange Attractor of Chaotic Magnons Observed in Ferromagnetic (CH3NH3)2CuCl4

    Yamazaki Hitoshi, Mino Michinobu, Nagashima Hiroyuki, Warden Mike

    J Phys Soc Jpn   56 ( 2 )   742 - 750   1987.2

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    By parallel pumping experiments in ferromagnetic (CH3NH3)2CuCl4 chaotic auto-oscillations of magnon amplitude are observed at the pumping frequency of 9.39 GHz and the temperature of 1.65 K. Strange attractors constructed in three-dimensional phase space from time series data of chaotic oscillations display properties of stretching and folding of the sheet of trajectories. Fractal dimensions of strange attractors are obtained by the method of the correlation integral as a function of driving microwave power. With increasing driving power fractal dimension increases from 1.6 to 3.4. The largest Lyapunov exponent is obtained as $0.43\pm 0.05$ by using empirical return maps. The chaotic state arises directly from period-two oscillations without cascade of period doubling bifurcations.

    DOI: 10.1143/JPSJ.56.742

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  • Characterization of Chaotic States of Parallel-Pumped Magnons in Yttrium Iron Garnet

    Michinobu Mino, Hitoshi Yamazaki

    Journal of the Physical Society of Japan   55 ( 12 )   4168 - 4171   1986

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    Parallel pumping experiments in YIG magnons have been performed at 4.2 K. Above the spin-wave instability threshold, chaotic auto-oscillations are observed. From time-series data, return maps, fractal dimensions, positive Lyapunov exponents, phase space portraits of strange attractors and two-dimensional Poincare sections are obtained. The largest Lyapunov exponent, which describes the degree of chaos, is obtained as 0.34. The Poincare sections of the phase space trajectories exhibit the stretching and holding which are characteristics of strange attractors. © 1986, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.

    DOI: 10.1143/JPSJ.55.4168

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MISC

  • 24pCF-11 Photoconductivity and carrier control in TMTSF donor single crystals

    Ohsima K., Iwama T., Mino M.

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   882 - 882   2012.3

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  • 27aYE-10 Science course for high school students at Okayama University

    Mino M., Harada I., Oshima K., Okada K., Inada Y.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   401 - 401   2009.3

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  • 25pPSA-10 Magnetaization process in garnet thin film under alternating field

    MINO Michinobu, MASUDA Yoshihisa

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   318 - 318   2008.2

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  • 物理チャレンジ2008・フジックスライブ

    味野道信

    大学の物理教育   14 ( 3 )   158 - 158   2008

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  • 21pPSB-54 Microwave radiation from nonequilibrium magnon system II

    Mino M.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   445 - 445   2007.8

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  • 24aPS-16 Aperiodic magnetaization process in garnet thin film under alternating field

    Masuda Y., Mino M.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   324 - 324   2007.8

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  • 21aRE-12 Dependence of domain patterns on the field sweep rate

    Kudo K., Mino M., Nakamura K.

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   368 - 368   2007.2

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  • 21aPS-9 Motion of magnetic domain wall in YIG under alternating field

    Masuda Y., Ide T., Mino M.

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   301 - 301   2007.2

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  • 18aPS-130 Microwave radiation from nonequilibrium magnon system

    Mino M., Fujikawa K., Tsukamoto M.

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   433 - 433   2007.2

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  • 23aPS-112 Microwave radiation from parametrically excited magnon system II

    Mino M., Fujikawa K., Tsukamoto M.

    Meeting abstracts of the Physical Society of Japan   61 ( 2 )   341 - 341   2006.8

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  • 27pPSB-60 Micowave radiation from parametrically excited YIG film

    MINO Michinobu, FUJIKAWA Katsumi, TSUKAMOTO Masayuki

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   464 - 464   2006.3

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  • 27aTE-7 Low frequency and low temperature ESR measurement of nano scale molecular magnet V15

    Kajiyoshi K., Kambe T., Mino M., Nojiri H., Koegler P., Luban M.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   425 - 425   2006.3

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  • Auto-oscillations of spin-waves under dual pumping

    Mino M., Tsukamoto M., Yamazaki H.

    Meeting abstracts of the Physical Society of Japan   57 ( 2 )   386 - 386   2002.8

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  • Relaxation time of parametrically excited magnetostatic mode in YIG II

    Tsukamoto M., Mino M., Yamazaki H.

    Meeting abstracts of the Physical Society of Japan   57 ( 2 )   385 - 385   2002.8

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  • Control of Chaos on a Magnon System by Modulation of Microwave

    Matsushima A., Mino M., Urakami H., Yamazaki H.

    Meeting abstracts of the Physical Society of Japan   57 ( 2 )   385 - 385   2002.8

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  • 25aPS-95 Power dependence of micro-wave radiation from PeBO

    MINO M., ISHIHARA K., TSUKAMOTO M., YAMAZAKI H.

    Meeting abstracts of the Physical Society of Japan   57 ( 1 )   417 - 417   2002.3

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  • 25aPS-96 Relaxation time of parametrically excited magnetostatic mode in YIG

    Tsukamoto M., Mino M., Yamazaki H.

    Meeting abstracts of the Physical Society of Japan   57 ( 1 )   417 - 417   2002.3

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  • 31a-YG-8 The Antiferromagnetic Resonance Measurements of KCuF_3

    Shi Q., Mino M., Yamazaki H, Yamada I

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting   51 ( 3 )   254 - 254   1996.3

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  • 28p-PS-26 f(α) spectra and strange attractors in chaotic magnon systems. II.

    Mino Michinobu, Yamazaki Hitoshi, Nakamura Katsuhiro, Warden M., Senning B.

    44 ( 3 )   361 - 361   1989.3

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  • 27p-PS-30 (CH_3NH_3)_2CuCl_4におけるマグノンカオス(磁性ポスターセッション)

    山嵜 比登志, 味野 道信

    年会講演予稿集   42 ( 3 )   46 - 46   1987.3

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  • 29a-CN-2 マグノンにおける決定論的カオスの観測II(磁性(理論・化合物))

    味野 道信, 山嵜 比登志, Warden M., Waldner F., 長島 弘幸

    年会講演予稿集   41 ( 3 )   28 - 28   1986.3

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  • 物理チャレンジ2019報告:II.第2チャレンジ実験問題

    長谷川修司, 石川真理代, 市原光太郎, 一宮彪彦, 大塚洋一, 井通暁, 海老崎功, 右近修治, 川村康文, 岸澤眞一, 毛塚博史, 小牧研一郎, 近藤泰洋, 櫻井一充, 下田正, 真梶克彦, 末元徹, 鈴木功, 瀬川勇三郎, 武士敬一, 遠山濶志, 林壮一, 深津晋, 松本益明, 松本悠, 味野道信

    日本物理学会2019年秋季大会 

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  • 大きく変わった物理チャレンジ2020(オンライン化によるニューノーマル)

    長谷川修司, 岸澤眞一, 佐藤誠, 植田毅, 一宮彪彦, 味野道信

    第81回応用物理学会秋季学術講演会  2020.9.10 

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  • 物理チャレンジ2018報告:III 第2チャレンジ実験問題

    大塚洋一, 石川真理代, 市原光太郎, 一宮彪彦, 井通暁, 海老崎功, 右近修治, 川村康文, 岸澤眞一, 毛塚博史, 小牧研一郎, 近藤泰洋, 櫻井一充, 下田L, 真梶克彦, 末元徹, 鈴木功, 瀬川勇三郎, 武士敬一, 遠山濶志, 長谷川修司, 林壮一, 深津晋, 松本益明, 松本悠, 味野道信

    日本物理学会2018年秋季大会  2018.9.14 

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  • 異なる周波数を持つマイクロ波同時励起下での強磁性YIGスピン波の不安定化増大閾値

    阪井昂樹, 味野道信

    応用物理・物理系学会中国四国支部合同学術講演会  2018.8.4 

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  • 物理チャレンジ2017報告:IV 第2チャレンジ実験問題

    大塚洋一, 石川真理代, 市原光太郎, 一宮彪彦, 井通暁, 海老崎功, 右近修治, 大嶋孝吉, 川村康文, 岸澤眞一, 毛塚博史, 小牧研一郎, 近藤泰洋, 櫻井一充, 下田正, 真梶克彦, 末元徹, 鈴木功, 瀬川勇三郎, 武士敬一, 遠山濶志, 長谷川修司, 林壮一, 深津晋, 松本益明, 松本悠, 味野道信

    日本物理学会 2017年秋季大会  2017.9.21 

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  • 科学研究者を目指す高校生への物理教育の試み 岡山大学での実践例

    原田勲, 味野道信, 稲田佳彦

    日本物理学会 2017年秋季大会  2017.9.21 

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  • 物理チャレンジ2016報告:IV. 第2チャレンジ実験問題

    松本益明, 一宮彪彦, 井通暁, 右近修治, 大嶋孝吉, 大塚洋一, 川村康文, 岸澤眞一, 毛塚博史, 小牧研一郎, 近藤泰洋, 桜井一充, 下田正, 真梶克彦, 末元徹, 鈴木功, 瀬川勇三郎, 武士敬一, 遠山濶志, 長谷川修司, 林壮一, 深津晋, 松本悠, 味野道信

    日本物理学会2016秋季大会  2016.9.13 

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  • 岡山大学における高校生を対象にしたグローバルサイエンスキャンパス物理分野の取り組み

    味野道信, 稲田佳彦, 原田勲

    日本物理学会2016秋季大会  2016.9.13 

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  • 非平衡マグノン系からの放射マイクロ波時系列観測

    日本物理学会 2015年秋季大会  2015 

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  • Microwave radiation from parametrically excited magnons

    20th International Conference on Magnetism  2015 

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  • 物理チャレンジ2015 報告:IV 第2 チャレンジ実験問題

    日本物理学会 2015年秋季大会  2015 

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  • Microwave radiation from parametrically excited magnons

    20th International Conference on Magnetism  2015 

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  • 物理チャレンジを軸にした物理才能教育における地域連携

    日本物理学会第67回年次大会  2012 

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  • 物理チャレンジを活用した物理普及活動

    日本物理会2012年秋季大会  2012 

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  • 第8回全国物理コンテスト・物理チャレンジ2012実験問題

    日本物理会2012年秋季大会  2012 

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  • Chaotic motion of magnetic domain structure under alternate field

    磁性国際会議(ICM2012)  2012 

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  • 岡山大学における学生提案型「先取り研究」の取り組み

    日本物理会2012年秋季大会  2012 

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  • 非平衡マグノン系緩和の放射マイクロ波スペクトルによる観測II

    日本物理学会第67回年次大会  2012 

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  • 第7回全国物理コンテスト・物理チャレンジ2011実験問題

    日本物理学会2011秋季大会  2011 

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  • 才能育成教育の構築 -地域に科学教育拠点を-

    日本物理学会2011秋季大会  2011 

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  • 非平衡マグノン系緩和の放射マイクロ波スペクトルによる観測

    日本物理学会2011秋季大会  2011 

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  • 振動磁場下ガーネット薄膜における磁化課程異常

    日本物理学会 第63回年次大会  2008 

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  • 岡山大学の中高生に向けた理科教育プログラムの取り組み

    日本物理学会 2008年秋季大会  2008 

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  • 第4回全国物理コンテスト・物理チャレンジ2008報告III 全体報告

    日本物理学会 2008年秋季大会  2008 

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  • 振動磁場下のYIGにおける磁壁運動

    日本物理学会 2007春期大会  2007 

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  • 非平衡マグノン系における放射マイクロ波スペクトルの励起電力変化

    日本物理学会 2007春期大会  2007 

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  • 振動磁場下のガーネット薄膜における非周期磁化課程

    日本物理学会 2007年次大会  2007 

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  • 全国物理コンテスト「物理チャレンジ」

    日本物理学会 中国・四国支部,応用物理学会中国四国支部 日本物理教育学会中国四国支部 2007年度支部学術講演会  2007 

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  • 非平衡マグノン系における放射マイクロ波スペクトルの励起電力変化II

    日本物理学会 2007年次大会  2007 

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  • 非線形励起されたYIG 薄膜マグノン系からのマイクロ波放射

    日本物理学会第61 回年次大会  2006 

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  • 磁気共鳴による非平衡スピン波系の研究

    第45 回電子スピンサイエンス学会年会  2006 

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  • Direct estimation of zero-field energy gap in the nano-scale single molecular magnet V15

    International Conference on Magnetism (ICM2006)  2006 

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  • 非平衡マグノン系からのマイクロ波放射II

    日本物理学会2006 年秋季大会  2006 

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  • ナノスケール分子磁性体V15 における極低温低周波ESR

    日本物理学会 第61 回年次大会  2006 

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  • Microwave radiation from parametrically excited YIG

    International Conference on Magnetism (ICM2006)  2006 

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  • 磁性薄膜におけるストライプ磁区構造緩和

    日本物理学会2005年秋季大会  2005 

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  • 交番磁場下におけるストライプ磁区クラスタの緩和過程

    日本物理学会中国支部・四国支部、応用物理学会中国四国支部 2005年度学術講演会  2005 

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  • ナノスケール分子磁性体V15における低周波ESR

    日本物理学会2005年秋季大会  2005 

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  • 非線形励起されたYIG薄膜における静磁モードからのマイクロ波放射

    日本物理学会中国支部・四国支部、応用物理学会中国四国支部 2005年度学術講演会  2005 

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  • パラメトリック励起されたYIGマグノン系からの間欠的マイクロ波放射II

    日本物理学会第59回年次大会  2004 

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  • ガーネット磁区構造の交番磁場依存性

    日本物理学会応用物理学会中国四国支部例会  2004 

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  • 磁区パターンの交番磁場依存性

    日本物理学会2004年秋季大会  2004 

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  • 自然科学の楽しさを伝えたい -岡山大学サイエンススクールの試み-

    電気学会・教育フロンティア研究会  2004 

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  • Magnetic domain structure in thin film under alternate magnetic field

    International Conference on Magnetism 2003  2003 

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  • 交番磁場下ガーネット薄膜のストライプ状パターンサイズ分布

    日本物理学会第58回年次大会  2003 

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  • YIGにおけるスール1次不安定化によるマイクロ波放射

    日本物理学会第58回年次大会  2003 

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  • パラメトリック励起されたYIGからのマイクロ波の間欠的放射

    日本物理学会2003年秋期大会  2003 

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  • ガーネット薄膜ドメインパターンの交番磁場依存性

    日本物理学会2003年秋期大会  2003 

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  • パラメトリック励起されたYIGマグノン系からの間欠的マイクロ波放射

    日本物理学会中国四国支部例会  2003 

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  • スール1次不安定領域におけるスピン波系揺らぎの周波数分布

    日本物理学会2003年秋期大会  2003 

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  • 励起マイクロ波振幅変調によるYIGマグノン系カオスの制御

    日本物理学会中国支部・四国支部・応用物理学会中国四国支部2002年例会  2002 

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  • YIGにおけるパラメトリック励起された静磁モードの緩和時間II

    日本物理学会2002年秋季大会  2002 

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  • 2重励起によるスピン波系自励発振の観測

    日本物理学会2002年秋季大会  2002 

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  • Relaxation time of parametrically excited mognetostatic mode in YIG

    The 23rd International Conference on Low Temperature Physics  2002 

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  • マグノン系カオスのマイクロ波振幅変調による制御

    日本物理学会2002年秋季大会  2002 

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  • YIGにおけるパラメトリック励起された静磁モードの緩和時間

    日本物理学会第27回年次大会  2002 

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  • FeBO3マイクロ波放射の励起電力依存性

    日本物理学会第27回年次大会  2002 

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  • パラメトリック励起されたYIGマグノン系における静磁モードの緩和時間

    日本物理学会中国支部・四国支部・応用物理学会中国四国支部2002年例会  2002 

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  • Control of spin-wave instability threshold in YIG sphere

    The 23rd International Conference on Low Temperature Physics  2002 

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  • ガーネット薄膜磁区構造の交番磁場依存性

    日本物理学会中国支部・四国支部・応用物理学会中国四国支部2002年例会  2002 

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  • YIG薄膜におけるスピン波カオスの観察

    日本物理学会中国支部・四国支部,応用物理学会中国四国支部例会  2001 

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  • Parametrically excited magnetoelastic waves in FeBO3

    Third Asia-Pacific EPR/ESR Symposium  2001 

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  • 非線形励起された強磁性体における静磁モードからのマイクロ波放射

    日本物理学会中国支部・四国支部,応用物理学会中国四国支部例会  2001 

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  • Microwave radiation from magnetostatic mode in high power FMR

    Third Asia-Pacific EPR/ESR Symposium  2001 

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  • 交番磁場下における磁区構造パターンの観察

    日本物理学会中国支部・四国支部,応用物理学会中国四国支部例会  2001 

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  • FeBO3における磁気弾性波のパラメトリック励起による自励発振

    日本物理学会中国支部・四国支部,応用物理学会中国四国支部例会  2001 

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  • FeBO3におけるマグノン-フォノン結合系の自励発振

    第56回日本物理学会年次大会  2001 

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  • 交番磁場における磁区構造の緩和現象III

    第55回日本物理学会年会  2000 

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  • Half the pumping frequency radiation in YIG under the parallel pumping

    International Conference on Ferrites (ICF8)  2000 

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  • スピン波系カオスのフィードバックによる制御

    日本物理学会第55回年次大会  2000 

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  • Relaxation of magnetic domain structure in garnet thin film under field cycles

    International Conference on Magnetism (ICM2000)  2000 

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Research Projects

  • Development of microwave device using Bose-Einstein condensation at magnon system

    Grant number:24656236  2012.04 - 2016.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    Mino Michinobu

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    Grant amount:\2990000 ( Direct expense: \2300000 、 Indirect expense:\690000 )

    Bose Einstein condensation of a magnon system driven by microwave at room temperature has been reported with using the Brillouin light scattering technique. Another effective experiment about a nonequilibrium magnon system is to study microwave radiations from a parametrically excited sample. As a viewpoint of developing new nonlinear microwave devices, microwave radiation from parametrically excited magnons was studied experimentally. Parallel pumping excitations and transverse pumping at the first-order Suhl instability were carried out on a ferromagnetic yttrium iron garnet (YIG). A high sensitivity microwave circuit was used to detect spectra of radiation microwave. At high pumping power, multi-frequency components are observed simultaneously. The spectra depend on static field, or magnetostatic modes. These spectra and the time series of microwave radiation show that a four-magnon scattering is important in a nonlinear relaxation process.

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  • Development of high precision THz-ESR system by using repealing pulsed magnetic fields

    Grant number:13554011  2001 - 2003

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    NOJIRI Hiroyuki, MATSUDA Yasuhiro, MINO Michinobu, YAMAZAKI Hitoshi, KOYAMA Keiichi, SAKON Takuo

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    Grant amount:\14100000 ( Direct expense: \14100000 )

    A high precision terahertz ESR system has been developed by using a repeating pulsed magnetic field. The system is capable of generating pulsed magnetic fields up to 30 T every two seconds. The drastic improvement of signal to noise ratio is achieved by the signal averaging technique. The ratio becomes at least 50 times higher than that of the conventional ESR spectrometer by using a single shot type pulse field. The maximum frequency up to 3 THz can be used and it is extremely higher than that of the commercial W-band ESR spectrometer. Moreover, the efficiency defined by the possible number of scans par unit time is much larger than that of ESR spectrometer using superconducting magnets. The typical resolution of the present system is 10 gauss in simple hardware averaging method. The resolution ca be improved to 1 gauss by using a software averaging by suing a peak picking process. Test experiments have been made on a ladder compound and a micro single crystal of nano-magnetic cluster. Even a very weak forbidden transition can be observed by present system. The present result leads to the application of a repeating pulsed magnetic field for various types of spectroscopy such as Raman scattering or X-ray spectroscopy for solid state.

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  • ガーネット薄膜における動的磁区構造の研究

    Grant number:12740236  2000 - 2001

    日本学術振興会  科学研究費助成事業 奨励研究(A)  奨励研究(A)

    味野 道信

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    Grant amount:\500000 ( Direct expense: \500000 )

    膜面垂直方向に磁化容易軸を持つ,Bi置換ガーネット薄膜を試料にして磁区構造パターンに関する研究をおこなった.この組成の試料は,ファラデー効果により磁区構造が偏光顕微鏡で直接観察可能である.まず,今までに行った低周波領域での緩和に伴うパターン変化実験結果の解析を進めた.1Hz以下の交番磁場下で迷路状構造がストライプ状パターンに変化する場合のパターン全体の相関長の変化,ドメインの分岐点や終端などの欠陥分布の解析を行った.パターンの相関長は交番磁場を加えることにより最初緩やかにべき関数的に増加するが,緩和がある程度進んだ段階から速さが増加する.これは,パターンに最初含まれる小さな渦状構造の消滅に関連している.印可する交番磁場の振幅によって,この渦構造の消滅までの時間が異なるため,緩和速度が変化する時間も異なるが,速度変化点でのパターンは同様な相関長を持つことが明らかとなった.パターンの欠陥も初期状態では均一に分布しているが,緩和が進むと特定の領域に集中する.初期の緩和がゆっくりと進行している領域では,欠陥間の距離を規格化すると分布は同一であることが分かった.さらに,交番磁場の周波数及び振幅を増加させた場合,ストライプが異なる方向に平行に揃った領域間での競合が発生する.この時,ストライプが平行に揃った各ドメインサイズはは交番磁場振幅が大きくなると減少する.これは相転移点近傍の高温側で見られるのクラスターサイズの問題に関連していると思われる.より高周波および大振幅領域で,パターンの時間平均コントラストの解析から動的構造相転移の検証を試みたが,磁場強度の不足等によりその存在の確証を得るには至らなかった.しかし,時間平均後にも構造を持つことより,外部交番磁場の周期に比べて長周期な自発構造が発生していることを確認した.

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  • 磁性薄膜における磁区パターン形成過程の観測

    Grant number:10740191  1998 - 1999

    日本学術振興会  科学研究費助成事業 奨励研究(A)  奨励研究(A)

    味野 道信

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    Grant amount:\1900000 ( Direct expense: \1900000 )

    強磁性体薄膜において観測される磁区構造の,交番磁場下における緩和現象に関する研究を行った.強磁性体ガーネット薄膜は膜面の垂直方向に磁化容易軸を持つため,偏光顕微鏡を用いて直接磁区構造を観察することができる.外部静磁場がゼロの場合に特定の条件下で観測される島状の磁区構造を初期状態として,これがストライプの迷路状構造に変化する過程に関して測定を行った.磁区のストライプ幅は,異方性と磁化によりほぼ一定に保たれるので,今回は,磁区の長さの逆数に相当する島状磁区の数を特徴的な量として測定を行った.島の数は,最初は加える交番磁場の回数に対して指数関数的に急速に減少する.しかし,ある程度減少した後は,交番磁場回数に対してべき関数的なゆっくりした現象過程に変化する.これは,島状の構造が磁区が平行に揃ったストライプ構造に変化する過程が,2段階に起こっていることを意味している.最初の島が繋がる過程,つまり短い帯が発生する過程は試料のいくつかの領域で独立に発生する.つまり離れた2点間には相関がなく,帯の向きは各領域でほぼランダムであると考えられる.この自発的対称性の破れが発生する初期過程は比較的短時間に急速に,つまり指数関数的に進行すると考えられる.各領域の帯の長さが有る程度発達し互いに接するようになると,試料全体に渡って帯の向きが揃い始める緩和過程に移行する.これが,後半に観測された磁区が伸びる過程であり,帯の向きが異なる各領域間の競合であると考えられる.この過程は,各領域の界面間の相互作用が緩和の駆動力となるため,比較的ゆっくりと長時間にわたって進行することになる.このためにべき関数的な特徴が現れたののではないかと考えられる.

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  • Microwave Radiation from YIG Magnons

    Grant number:09640435  1997 - 1998

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    YAMAZAKI Hitoshi, MINO Michinobu

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    Grant amount:\3600000 ( Direct expense: \3600000 )

    Unstable growth of particular magnon can be generated by nonlinear excitation (parametric excitation) with high microwave power. Those magnons in the nonequilibrium state are scattered to other magnons, which have different frequencies and wave_ vectors. Those magnons occasionally radiate microwave. Magnon interactions or magnon condensation state can be studied by detecting microwave radiation from the nonequilibrium magnon system.
    Nonequilibrium magnons excited in a single crystal of ferrimagnet YIG (Yttrium Iron Garnet), which was placed in a microwave cavity, nonlinearly couples with microwave photon with configuring magnon-photon nonlinearly coupled oscillator mode. Those coupled modes were studied by means of additional weak microwave signal. Theoretical calculations, which consider coupled systems of resonator mode and magnetic sample, are found to be in good agreement with the experimental data.
    Microwave radiation was detected from a sphere single crystal of YIG with applying both static and microwave magnetic field parallel to the [111] axis, easy magnetization axis. A disk sample was also used with applying magnetic fields parallel to the sample surface, which is perpendicular to the [111] axis. The frequencies of pumping microwave were 9.5 and 15.4 GHz. Radiated microwave was detected by a small pick-up coil wounded around a sample and analyzed by a microwave spectrum analyzer. The intensity of radiated microwave was measured as a function of time after the end of pulse pumping. As a result, relaxation time of magnon is directly determined as 19 p s which is in agreement with spin-wave relaxation time measured by other experiments.

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  • Condensed States of Nonequlibrium Magnons in Ferromagnets

    Grant number:08454098  1996

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    YAMAZAKI Hitoshi, MINO Michinobu

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    Grant amount:\6900000 ( Direct expense: \6900000 )

    Nonequilibrium states of magnon having the specific wave vector can be excited by parametric exciation, which is achieved by applying intense microwave magnetic field parallel to the magnetic moments in a ferromagnet. These magnons loose energy by magnon-magnon scattering processes, resulting to condensed states at the bottom of the magnon band. The purpose of this research is to clarify the condensed states by detecting microwave emission from the condensed magnon. The nonlinear excitation experiments were performed by applying magnetic field parallel to the easy magnetization axis [111] of a sphere of Yttrium-Iron-Garnet (YIG) single crystal in diameter of 1 mm. Microwave of 9.6 GHz from a synthesizer was amplified to the maximum 16 W by a Traveling Wave Tube Amplifier (TWTA). Microwave signal was detected by a small pick-up coil wounded around the sample. The microwave signal was observed by a microwave spectrum analyzer with using low-pass filter and low-noise amplifier. Frequency of the detected microwave was different from that of exciation microwave. The detected emission has a frequency of lower than the bottom of the spin-wave band. The second and third higher harmonics are also observed. Line shapes and frequency shift of the emission depend on temperature. Nonlinear interaction between photons in a microwave cavity and monequilibrium magnon pairs becomes important and this coupled system is under investigation by both experimentally and theoretically.

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  • 磁壁移動に関する非線形動力学の光学的観測

    Grant number:08874036  1996

    日本学術振興会  科学研究費助成事業 萌芽的研究  萌芽的研究

    山嵜 比登志, 味野 道信, 圓山 裕

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    Grant amount:\2100000 ( Direct expense: \2100000 )

    交流磁場中におけるガ-ネット薄膜の磁壁移動による磁区構造の緩和過程に関する研究を行った.ガ-ネット薄膜では赤外および可視光の長波長領域でのファラデー効果を用いて,その磁区構造を偏光顕微鏡によって観測することができる.磁化容易軸,つまり膜面に対して垂直方向に磁場を加えて試料を単磁区化した後に磁場を急速に取り除くと,渦巻き状の磁区が複雑に組み合わさった構造が観測される.その後,数百ガウスの交流磁場(本実験では0.25Hz)を繰り返し加えることによって,この磁区構造に変化が発生する.このとき帯状の磁区がY字状に分岐する点に着目し,定量的解析を行った.このY字状分岐の数は,交流磁場を加えることによって指数関数的に減少する.これは急激な磁場変化のために凍結されていた構造が,摂動磁場によって緩和する過程であると考えられる.さらにその分岐点の空間的分布を調べるために,相関積分法を用いた解析を行った.初期状態では相関距離と相関積分の両対数プロットは傾きが約2の直線上にあり,薄膜の2次元平面上にほぼ均等に分布していることがわかる.交流磁場を加えた後には,相関距離の短い領域で傾きが1.5程度と2次元から1次元の方向に変化する傾向が読み取れた.これは,最初渦巻状に入り組んでいた磁区構造が,磁壁が平行にそろったストライプ状の構造に変化するためと思われる.つまり,磁壁が平行にそろった各領域の中ではY字状分岐が減少し,隣接するストライプ状領域との境界上に沿って1次元的に分岐が残るためである.この時,両対数プロットの傾きが変化する相関距離はストライプ状構造の特徴的長さを与えていると考えられる.

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  • 変調励起下でのスピン波系非線形緩和の研究

    Grant number:06740292  1994

    日本学術振興会  科学研究費助成事業 奨励研究(A)  奨励研究(A)

    味野 道信

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    Grant amount:\900000 ( Direct expense: \900000 )

    大電力マイクロ波によって強磁性体や反強磁性体のマグノンを励起すると,その非線形緩和のためにマグノン数に自励発振さらにはカオスが発生する.この発振現象について以下の2点について研究を行った.
    1.変調励起下での引き込み現象の観測
    一般に2つの振動子系が非線形に結合されている場合に,周波数の引き込み現象や準周期ルートからのカオスが観測される.今回マグノン系の自励発振に,励起マイクロ波に振幅変調を加える方法と,外部静磁場に変調を加える2つの方法を用いて,発振の引き込み現象について研究を行った.どちらの場合も,ア-ロルドの舌と呼ばれている状態図によく似た引き込みの相図を得ることができた.このことは,励起マイクロ波及び外部静磁場が非線形なコントロールパラメータとして発振現象に関与していることを示唆している.従って今後このパラメータを精密に制御する事によって,カオス発生点近傍及びカオス-カオス転移点での普遍性などの研究が可能であると思われる.
    2.マグノンの緩和定数と自励発振の関係
    一定の励起周波数のもとで外部静磁場を変化させると,励起されるマグノンの波数が増滅し緩和定数を変化させることができる.この時,自励発振周波数がどう変化するか測定を行った.磁場を低磁場側に変化させ,励起されるマグノンの緩和時間を短くすると発振周波数は高くなる結果を得た.次にシミュレーションで同様に緩和時間を変化させたところ,自励発振周波数は高周波数側にシフトしたが,変化の様子は実験とは異なっていた.このことから,自励発振機構には波数依存性を持つ他のパラメータが重要であることがあらためて明らかとなった.

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  • 高温酸化物超伝導体におけるフォノン異常の中性子散乱による研究

    Grant number:05224103  1993

    日本学術振興会  科学研究費助成事業 重点領域研究  重点領域研究

    新井 正敏, 遠藤 康夫, 山田 和芳, 味野 道信, 本河 光博

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    Grant amount:\1500000 ( Direct expense: \1500000 )

    本研究では酸化物高温超伝導体の機構の解明をフォノンの異常と言う観点より研究してきた。一方スピン揺動が超伝導の発生に関与しているらしい実験事実も多くの測定手段により報告されており、両者の相互作用を解明することは、本機構解明にとって、大変重要な問題であった。折しもCuGeO_3なる一次元反強磁性体がSpin-Peierls転移を示すことが報告され、スピンと格子が直接に相互作用をする系として、高温超伝導機構の解明の立場からも非常に興味を持たれた。本研究ではこのような観点に立って、CuGeO_3のスピン相互作用異常、格子構造異常、格子のダイナミックス異常を重点的に研究した。その結果Spin-Peierls転移の生ずるc-軸方向とは直角面内で、格子の構造及びダイナミックスに非常に大きな異常が室温より成長し、転移温度(Tsp=14K)でその格子異常がスピン相互作用と競合することにより、Spin-Peierls転移が生ずることを突き止めた。つまり、銅原子を一次元鎖につないでいる酸素原子がa-b面内で、構造異常を引き起こし、それが銅原子間の超交換相互作用のc-軸方向の変化を生むことにより、スピン-スピン相互作用に変調を起こすと考えられる。しかしながら、より定量的な結果は今後のより詳しい測定、解析を待たねばならない。

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  • マグノン系の非線形励起とカオスの研究

    Grant number:02952070  1990

    日本学術振興会  科学研究費助成事業 奨励研究(特別研究員)  奨励研究(特別研究員)

    味野 道信

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    Grant amount:\1000000 ( Direct expense: \1000000 )

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