Updated on 2024/12/22

写真a

 
MINO Michinobu
 
Organization
Institute of Global Human Resorce Development Professor
Position
Professor
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Degree

  • 学術博士 ( 岡山大学 )

Research Interests

  • chaos

  • Science education

  • Electron Spin Resonance

  • Magnetic domain structure

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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Professional Memberships

  • THE SOCIETY OF ELECTRON SPIN SCIENCE AND TECHNOLOGY

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  • 日本物理学会

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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

    Web of Science

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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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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

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

    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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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    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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  • 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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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    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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MISC

  • 岡山大学における高校生を対象にした科学教育物理分野の取り組み

    味野道信, 味野道信, 稲田佳彦, 稲田佳彦, 原田勲

    日本物理学会講演概要集(CD-ROM)   73 ( 2 )   2018

  • 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

    日本物理学会講演概要集(CD-ROM)   72 ( 2 )   2017

  • 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, 味野道信, 稲田佳彦, 稲田佳彦, 原田勲

    日本物理学会講演概要集(CD-ROM)   71 ( 2 )   2016

  • 物理チャレンジを核にした高大連携物理教育

    味野道信, 稲田佳彦, 塩飽顕光, 原田勲

    日本物理学会講演概要集   68 ( 1 )   2013

  • 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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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

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Presentations

  • 物理チャレンジ2024報告Ⅱ:第2チャレンジ実験問題

    末元徹, 五十嵐美樹A., 石川真理代B., 市原光太郎, 一宮彪彦D., 右近修治E., 海老崎功F., 大嶋孝吉G., 大塚洋一H., 川村康文I., 岸澤眞一J., 毛塚博史K., 小池洋二L., 小林一人M., 小牧研一郎, 近藤泰洋L., 櫻井一充O., 佐々田博之A., 真梶克彦P., 鈴木功Q., 武士敬一R., 西野友年S., 長谷川修司T., 林壮一U., 深津晋T., 松本益明E., 松本悠T., 眞砂卓史U., 三木一司V., 水谷紫苑W., 味野道信X., 山崎詩郎Y., 吉澤雅幸Z., 吉村勇治AA

    日本物理学会第79回年次大会  2024.9.16 

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    Event date: 2024.9.16 - 2024.9.19

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  • 物理チャレンジ 2021 報告III:第 2 チャレンジ(実験問題)

    一宮彪彦, 石川真理代, 市原光太郎, 右近修治, 海老崎功, 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, 櫻井一充, 真梶克彦, 末元徹, 鈴木功, 武士敬一, 長谷川修司, 林壮一, 松本悠, 松本益 明, 味野道信, 吉村勇治

    日本物理学会 2021 年秋季大会 

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    Event date: 2021.9.20 - 2021.9.23

    Presentation type:Oral presentation (general)  

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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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    Event date: 2019.9.10 - 2019.9.13

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  • 物理チャレンジ2023報告Ⅱ:第2チャレンジ実験問題

    末元徹, 五十嵐美樹, 石川真理代, 市原光太郎, 一宮彪彦, 右近修治, 海老崎功, 大嶋孝吉, 大塚洋一, 川村康文, 岸澤眞一, 毛塚博史, 小池洋二, 小林一人, 小牧研一郎, 近藤泰洋, 櫻井一充, 佐々田博之, 真梶克彦, 鈴木功, 武士敬一, 西野友年, 長谷川修司, 林壮一, 深津晋, 松本益明, 松本悠, 眞砂卓史U, 三木一司, 水谷紫苑, 味野道信, 山崎詩郎, 吉村勇治

    日本物理学会78回年次大会  2023.9.17 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 物理チャレンジ2022報告Ⅲ- - 実験問題部会

    川村康文, 五十嵐美樹, 石川真理代, 市原光太郎, 一宮彪彦, 海老崎功, 右近修治, 大嶋孝吉, 大塚洋一, 岸澤眞一, 毛塚博史, 小池洋二, 小牧研一郎, 近藤泰洋, 櫻井一充L, 佐々田博之, 柴崎幸貴, 真梶克彦, 末元徹, 鈴木功, 武士敬一, 西野友年, 長谷川修司, 林壮一, 松本益明, 松本悠, 三木一司, 水谷紫苑W, 味野道信, 山崎詩郎, 吉村勇治

    日本物理学会2022年秋季大会  2022.9.13 

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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

    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)

    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)

    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)

    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)

    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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Class subject in charge

  • Basic Physics Laboratory (2024academic year) Third semester  - 火5~8

  • Introduction to Solid State Physics (2024academic year) 3rd and 4th semester  - 水7~8

  • Introduction to Thermodynamics (2024academic year) Second semester  - 金7~8

  • Research Seminar (2024academic year) 1st semester  - その他

  • Research Seminar (2024academic year) Fourth semester  - その他

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