Updated on 2025/07/09

写真a

 
ADACHI Hiroto
 
Organization
Scheduled update Associate Professor
Position
Associate Professor
External link

Degree

  • 博士(理学) ( 京都大学 )

Research Areas

  • Nanotechnology/Materials / Applied condensed matter physics  / スピントロニクス

  • Natural Science / Magnetism, superconductivity and strongly correlated systems

Education

  • 京都大学大学院理学研究科   物理学・宇宙物理学専攻 博士後期課程  

    2000.4 - 2003.11

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  • 京都大学大学院理学研究科   物理学・宇宙物理学専攻 修士課程  

    1998.4 - 2000.3

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  • 京都大学理学部    

    1994.4 - 1998.3

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Research History

  • - 岡山大学異分野基礎科学研究所 准教授

    2016.4

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  • - Associate Professor,Research Institute for Interdisciplinary Science,Okayama University

    2016

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  • 日本原子力研究開発機構   研究副主幹

    2014.4 - 2016.3

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  • 日本原子力研究開発機構   任期付き研究員

    2011.4 - 2014.3

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  • 日本原子力研究開発機構   博士研究員

    2010.4 - 2011.3

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  • Tohoku University   Institute for Materials Research

    2009.3 - 2010.3

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  • スイス連邦工科大学チューリッヒ校   日本学術振興会海外特別研究員

    2007.3 - 2009.2

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  • Okayama University   The Graduate School of Natural Science and Technology

    2003.12 - 2007.2

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Papers

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MISC

  • Local density of states in vortex states of nematic superconductors

    市岡優典, 上田貴裕, 安立裕人

    日本物理学会講演概要集(CD-ROM)   77 ( 1 )   2022

  • Non-magnetic impurity effects in vortex states of nematic superconductors

    市岡優典, 世良泰明, 上田貴裕, 安立裕人

    日本物理学会講演概要集(CD-ROM)   76 ( 2 )   2021

  • Vortex spin Hall effect and its experimental detection method

    平拓也, 加藤雄介, 市岡優典, 安立裕人

    日本物理学会講演概要集(CD-ROM)   76 ( 2 )   2021

  • Antiferromagnetic spin Seebeck effect near the Neel temperature Ⅱ

    Yamamoto Yutaka, Ichioka Masanori, Adachi Hiroto

    Meeting Abstracts of the Physical Society of Japan   75.1   940 - 940   2020

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    DOI: 10.11316/jpsgaiyo.75.1.0_940

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  • Superconducting fluctuations and spin Hall effect

    Taira Takuya, Kato Yusuke, Ichioka Masanori, Adachi Hiroto

    Meeting Abstracts of the Physical Society of Japan   75.1   1047 - 1047   2020

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    DOI: 10.11316/jpsgaiyo.75.1.0_1047

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  • Impurity Effect for Electron Structure in Vortex State

    Sera Yasuaki, Adachi Hiroto, Ichioka Masanori

    Meeting Abstracts of the Physical Society of Japan   75.1   1480 - 1480   2020

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    DOI: 10.11316/jpsgaiyo.75.1.0_1480

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  • Theory of spin pumping into spin-glass materials

    Fujimoto Yusei, Ichioka Masanori, Adachi Hiroto

    Meeting Abstracts of the Physical Society of Japan   74.2   771 - 771   2019

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    DOI: 10.11316/jpsgaiyo.74.2.0_771

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  • Twofold Symmetric Electronic Structure of a Vortex in Type-II Superconductors

    Sera Yasuaki, Adachi Hiroto, Ichioka Masanori

    Meeting Abstracts of the Physical Society of Japan   74.2   1429 - 1429   2019

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    DOI: 10.11316/jpsgaiyo.74.2.0_1429

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  • Spin Seebeck effect in an antiferromagnet near neel point

    Yamamoto Yutaka, Ichioka Masanori, Adachi Hiroto

    Meeting Abstracts of the Physical Society of Japan   74.1   1130 - 1130   2019

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    DOI: 10.11316/jpsgaiyo.74.1.0_1130

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  • Spin Seebeck effect in a ferromagnet near curie temperature

    Yamamoto Yutaka, Ichioka Masanori, Adachi Hiroto

    Meeting Abstracts of the Physical Society of Japan   73.2   566 - 566   2018

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    DOI: 10.11316/jpsgaiyo.73.2.0_566

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  • Spin diffusion equation in superconductors : Analysis near Tc

    Taira Takuya

    Meeting Abstracts of the Physical Society of Japan   73.2   567 - 567   2018

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    DOI: 10.11316/jpsgaiyo.73.2.0_567

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  • Impurity effect and vortex core size in local electronic states around vortex

    Hashitani Yuki, Tanaka Kenta K., Adachi Hiroto, Ichioka Masanori

    Meeting Abstracts of the Physical Society of Japan   72.1   1629 - 1629   2017

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    DOI: 10.11316/jpsgaiyo.72.1.0_1629

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  • Theory of spin pumping into superconductors

    Inoue Masashi, Adachi Hiroto, Ichioka Masanori

    Meeting Abstracts of the Physical Society of Japan   72.1   1259 - 1259   2017

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    DOI: 10.11316/jpsgaiyo.72.1.0_1259

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  • Spin Seebeck effect in ferrimagnets

    大沼 悠一, 安立 裕人, 齊藤 英治, 前川 禎通

    社団法人日本磁気学会研究会資料 = Bulletin of Topical Symposium of the Magnetics Society of Japan   209   29 - 34   2016.10

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  • 21aAD-7 Theory for thermal manipulation of spin pumping

    Ohnuma Y., Adachi H., Saitoh E., Maekawa S.

    Meeting Abstracts of the Physical Society of Japan   70   960 - 960   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_960

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  • 22aAD-2 Theory of the spin Seebeck effect

    Adachi Hiroto

    Meeting Abstracts of the Physical Society of Japan   70   1144 - 1145   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_1144

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  • 17aCG-2 Giant spin Seebeck effect in multilayer structures: Theory

    Adachi Hiroto, Maekawa Sadamichi

    Meeting Abstracts of the Physical Society of Japan   70   854 - 854   2015

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    DOI: 10.11316/jpsgaiyo.70.2.0_854

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  • 17aCG-3 Two sign changes of spin Seebeck effect in compensated ferrimagnets

    Ohnuma Y., Adachi H., Saitoh E., Maekawa S.

    Meeting Abstracts of the Physical Society of Japan   70   855 - 855   2015

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    DOI: 10.11316/jpsgaiyo.70.2.0_855

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  • 28pAF-5 Theory of unidirectional spin heat conveyer

    Adachi Hiroto, Maekawa Sadamichi

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   516 - 516   2014

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  • 7aBF-10 Theory of surface-plasmon-driven spin pumping

    Adachi Hiroto, Maekawa Sadamichi

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   248 - 248   2014

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  • 7pPSA-10 Theory of spin pumping in a trilayer system

    Ohnuma Y, Adachi H, Saitoh E, Maekawa S

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   275 - 275   2014

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  • 28pAF-4 Theoretical study of modulated ferromagnetic resonance relaxation due to the spin Seebeck effect II

    Ohnuma Y, Adachi H, Maekawa S

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   516 - 516   2014

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  • Heat and Spin Currents

    193   15 - 20   2013.12

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  • 27pXG-6 Phonons and the spin Seebeck effect

    Adachi Hiroto

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   764 - 764   2013.3

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  • Theory of acoustic spin pumping

    Adachi Hiroto, Maekawa Sadamichi

    Meeting Abstracts of the Physical Society of Japan   68 ( 0 )   406 - 406   2013

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  • Theoretical consideration on the relationship between spin pumping & spin susceptibility

    Ohnuma Y, Adachi H, Saito E, Maekawa S

    Meeting Abstracts of the Physical Society of Japan   68 ( 0 )   407 - 407   2013

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  • 26aPS-6 Theoretical study of modulated ferromagnetic resonance relaxation due to the spin Seebeck effect

    Ohnuma Y, Adachi H, Saitoh E, Maekawa S

    Meeting Abstracts of the Physical Society of Japan   68 ( 0 )   499 - 499   2013

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  • 19aCC-1 Theory of efficiency of the spin-Seebeck Thermoelectric devices

    Adachi Hiroto, Maekawa Sadamichi

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   411 - 411   2012

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  • 24pBG-7 Theory of longitudinal spin-Seebeck effect

    Adachi Hiroto, Maekawa Sadamichi

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   506 - 506   2012

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  • 24pG-8 Theoretical study of spin-Seebeck effect with compensation effect

    Ohnuma Y, Adachi H, Maekawa S

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   506 - 506   2012

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  • 24pBG-5 Phonon-mediated spin Seebeck effect and acoustic spin pumping

    Uchida K, Adachi H, An T, Maekawa S, Saitoh E

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   505 - 505   2012

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  • 19aCC-2 Theoretical study of ferrimagnetic spin Seebeck effect

    Ohnuma Y, Adachi H, Saitoh E, Maekawa S

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   411 - 411   2012

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  • 25aHF-1 Theory of longitudinal spin-Seebeck effect

    Adachi Hiroto, Maekawa Sadamichi

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   454 - 454   2011

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  • 25aHF-10 The role of phonons in the spin-Seebeck effects

    Uchida K, Adachi H, An T, Ota T, Maekawa S, Saitoh E

    Meeting Abstracts of the Physical Society of Japan   66 ( 0 )   456 - 456   2011

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  • New Interplay of Spin and Heat

    ADACHI H, MAEKAWA S

    Magnetics Japan   5 ( 6 )   256 - 263   2010.6

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  • 22pGJ-8 Spin injection into ferromagnetic insulators

    Takahashi S, Ohe J, Adachi H, Maekawa S

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   487 - 487   2010

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  • 25aPS-37 Spin Seebeck effect in ferromagnetic insulators

    Takahashi S, Ohe J, Adachi H, Ieda J, Maekawa S

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   407 - 407   2010

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  • 24pWP-10 Numerical study on the thermally driven spin-wave spin current

    Ohe J, Adachi H, Takahashi S, Maekawa S

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   391 - 391   2010

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  • 22pGJ-10 Analysis of thermal spin current mediated by collective excitations II

    Adachi Hiroto, Takahashi Saburo, Maekawa Sadamichi

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   487 - 487   2010

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  • 24pWP-9 Analysis of thermal spin current mediated by collective excitations III

    Adachi Hiroto, Takahashi Saburo, Maekawa Sadamichi

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   391 - 391   2010

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  • 25aRK-4 How to detect the nematic phase in Sr3RU2O7

    Adachi Hiroto, Sigrist Manfred

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   408 - 408   2009.8

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  • 26aVD-5 Analysis of thermal spin current mediated by collective excitations

    Adachi Hiroto, Takahashi Saburo, Maekawa Sadamichi

    Meeting Abstracts of the Physical Society of Japan   64 ( 0 )   360 - 360   2009

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  • Zeeman effect and superconducting vortex states

    Solid state physics   42 ( 10 )   647 - 660   2007.10

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  • 20aXE-11 Stability of the FFLO state for the vortex-state

    Nakai N., Adachi H., Miranovic Predrag, Tsutsumi Y., Ichioka M., Machida K.

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   617 - 617   2007.2

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  • 25aZG-13 Quasiparticle thermal conductivity in a vortex state II

    Adachi H., Ichioka M., Machida K., Miranovic Predrag

    Meeting abstracts of the Physical Society of Japan   61 ( 2 )   487 - 487   2006.8

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  • 25pZG-7 Pauli paramagnetic effect and the form factor of neutron scattering in vortex state

    Ichioka M., Adachi H., Mizushima T., Machida K.

    Meeting abstracts of the Physical Society of Japan   61 ( 2 )   501 - 501   2006.8

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  • 30aUE-1 Electronic structure of FFLO vortex state in quasi-classical theory

    Ichioka M., Adachi H., Mizushima T., Machida K.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   646 - 646   2006.3

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  • 27aPS-9 Quasiparticle thermal conductivity in a vortex state

    Adachi H., Ichioka M., Machida K., Miranovic P.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   521 - 521   2006.3

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  • 22aYJ-6 Pauli paramagnetic effect and Knight shift in vortex state

    Ichioka M., Adachi H., Mizushima T., Machida K.

    Meeting abstracts of the Physical Society of Japan   60 ( 2 )   507 - 507   2005.8

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  • 19aYH-8 Anisotropic diamagnetic response in unvonventional superconductors II

    Adachi H., Ichioka M., Machida K., Miranovic P.

    Meeting abstracts of the Physical Society of Japan   60 ( 2 )   365 - 365   2005.8

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  • 26pWM-10 Electronic state in a superconducting vortex phase near the Pauli limit

    Adachi H., Ichioka M., Machida K.

    Meeting abstracts of the Physical Society of Japan   60 ( 1 )   589 - 589   2005.3

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  • 14pRC-13 Anisotropic diamagnetic response in unvonventional superconductors

    Adachi H, Ichioka M, Machida K, Miranovic P

    Meeting abstracts of the Physical Society of Japan   59 ( 2 )   534 - 534   2004.8

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  • 30aXA-12 FFLO transiton and the pairing state II

    Adachi H, Ikeda R

    Meeting abstracts of the Physical Society of Japan   59 ( 1 )   635 - 635   2004.3

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  • FFLO and the pairing state

    Adachi H., Ikeda R.

    Meeting abstracts of the Physical Society of Japan   58 ( 2 )   553 - 553   2003.8

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  • Phase Transition in Type II Superconductors with Pauli Paramagnetic Effect in High Magnetic Field II

    Adachi H., Koikegami S., Ikeda R.

    Meeting abstracts of the Physical Society of Japan   58 ( 1 )   536 - 536   2003.3

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  • Theoretical Study of Vortex Phase Diagram of CeCoIn_5 :

    79 ( 6 )   1023 - 1023   2003

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  • Phase Transition in Type II Superconductors with Pauli Paramagnetic Effect in High Magnetic Field

    Adachi H., Koikegami S., Ikeda R.

    Meeting abstracts of the Physical Society of Japan   57 ( 2 )   419 - 419   2002.8

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  • Microscopic Study of Quantum Vortex-Glass Transition Field in 2D Superconductor

    Ishida H., Adachi H., Ikeda R.

    Meeting abstracts of the Physical Society of Japan   56 ( 2 )   671 - 671   2001.9

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  • Quantum Fluctuations in Disorderd Triplet Superconductors

    Adachi H., Ikeda R.

    Meeting abstracts of the Physical Society of Japan   56 ( 1 )   545 - 545   2001.3

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  • Josephson-Vortex-Glass Transition

    Adachi H., Ikeda R.

    Meeting abstracts of the Physical Society of Japan   55 ( 1 )   438 - 438   2000.3

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  • Frequency mixing in quantum oscillations of Sr_2RuO_4

    OHMICHI E., ADACHI H., MORI Y., MAENO Y., ISHIGURO T.

    Meeting abstracts of the Physical Society of Japan   53 ( 2 )   703 - 703   1998.9

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  • Angle-dependent magnetoresistance oscillation of Sr_2RuO_4

    OHMICHI E., ADACHI H., MORI Y., MAENO Y., ISHIGURO T., OGUCHI T.

    Meeting abstracts of the Physical Society of Japan   53 ( 1 )   532 - 532   1998.3

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  • Low-Temperature Specific Heat of Layered Oxide Superconductor Sr_2RuO_4

    NISHIZAKI S., ADACHI H., MAENO E.

    Meeting abstracts of the Physical Society of Japan   53 ( 1 )   533 - 533   1998.3

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Presentations

  • Spin transport using antiferromagnetic magnons and superconducting vortices Invited

    Hiroto Adachi

    Spin Caloritronics XI, University of Illinois at Urbana-Champaign  2022 

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    Event date: 2022.5.23 - 2022.5.27

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  • Spin Seebeck/Pumping Effects near a Phase Transition Point Invited

    Hiroto Adachi

    Spin Caloritronics IX, The Ohio State University (Columbus)  2018 

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    Event date: 2018.6.24 - 2018.6.29

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  • Theory of spin pumping into superconductors Invited

    Hiroto Adachi

    New Excitations in Spintronics, Tohoku University (Sendai)  2018 

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    Event date: 2018.1.10 - 2018.1.14

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Research Projects

  • Theory of spin current phenomena utilizing the superconducting vortex as a real-space topological defect

    Grant number:22H01941  2022.04 - 2025.03

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

    安立 裕人, 大江 純一郎, 加藤 雄介, 市岡 優典

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    Grant amount:\8710000 ( Direct expense: \6700000 、 Indirect expense:\2010000 )

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  • トポロジカル磁性体のマグノンドラッグ効果を用いたスピン流熱電効果

    Grant number:21H01799  2021.04 - 2026.03

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    大江 純一郎, 河野 浩, 安立 裕人, 大槻 東巳

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    Grant amount:\13260000 ( Direct expense: \10200000 、 Indirect expense:\3060000 )

    非一様な磁化構造を有する磁性体中の熱電効果について、理論的研究を行った。特に、磁性体中の集団励起であるマグノンが誘起する電流、スピン流について解析的、数値計算の両面から研究を行った。非一様な磁化構造として、結晶の反転対称性の欠如によるジャロシンスキー・守谷相互作用によるねじれた磁化構造に注目した。1次元的な螺旋構造や、2次元的なスカーミオン構造がある系に温度勾配を印加した場合、系に誘起される非平衡マグノン分布を数値計算により明らかにした。また、このマグノンにより熱電効果の増強や、スピン流が誘起されることを明らかにした。分担者の大槻は、開放系などの非エルミート系の対称性をエルミート系で議論できることに着目し,非エルミート系のアンダーソン局在の臨界指数がエルミート系に対応づけられることを示した。量子マグノンを記述するシュレーディンガー方程式は非エルミートとなり,上述よりこれもエルミート系に対応づけた。これより量子マグノンホール効果が量子ホール効果と等価であることを示した。また,量子ダイナミクスをlong-short term memory networkというタイプのニューラルネットワークで解析できることを示した。分担者の河野は、反強磁性体のスピン移行トルクとその散逸補正(α項)、減衰トルク(β項)の微視的計算を行った。強磁性体との類似点・相違点に注意して整理する一方で、反強磁性体では2種類のスピン移行トルクが存在すること、スピン波のドップラーシフトには両方が同じ程度寄与することを示した。伝導電子のホッピングを調節することにより、反強磁性のトルクと強磁性のトルクを連続的につなげて議論した。

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  • 超伝導渦糸フローが生み出す新しいスピン流の理論的探求

    Grant number:19K05253  2019.04 - 2023.03

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    安立 裕人, 大江 純一郎

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    Grant amount:\3640000 ( Direct expense: \2800000 、 Indirect expense:\840000 )

    まず、令和3年度の研究開始直後に、令和2年度に進めていた研究成果、具体的には渦糸スピンホール効果によるスピンホール伝導度の微視的計算結果を、T. Taira et al., "Spin Hall effect generated by fluctuating vortices in type-II superconductors", Phys. Rev. B 103, 134417 (2021)] にて無事出版した。これにより、本研究課題の柱の1つが完了したことになる。
    これを受け、令和3年度はもう1つの柱である、渦糸スピンホール効果の数値シミュレーションに着手した。その結果、この研究テーマでは渦糸多体系の実時間ダイナミクスを直接相手にしなければならない一方で、現在我々のグループで保有している数値計算資源はまだまだ非力であることが判明した。そのため、昨年度の研究テーマは、より小規模な数値シミュレーションで現象の本質に迫れる、反強磁性スピンゼーベック効果の数値シミュレーションへと研究方向をシフトした。
    新たなターゲットとしたスピンホール効果とは、熱エネルギーからスピン流を作り出す現象であり、特に近年、自発磁化を持たない反強磁性体のスピンゼーベック効果が大きな注目を集めている。我々は、Cr2O3という反強磁性体の高磁場で観測された、スピンフロップ転移に伴うスピンゼーベック効果の符号反転に着目した。そして、時間依存ギンツブルグ・ランダウ方程式のシミュレーションにより、磁性体/非磁性電極の界面で通常の磁気的交換相互作用が働く場合には信号の符号反転は生じない一方、交換バイアス効果に類似の交換相互作用(ネールベクトルと伝導電子スピンが結合する交換相互作用)が界面で働く場合には、信号が符号反転することを明らかとした。

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  • Theoretical research for microscopic understanding and visualization of the spin Seebeck effect

    Grant number:15K05151  2015.04 - 2019.03

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

    ADACHI Hiroto

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    Grant amount:\3120000 ( Direct expense: \2400000 、 Indirect expense:\720000 )

    Spin Seebeck effect refers to the generation of spin current by a heat current applied to a magnet. In this project, we have theoretically investigated the spin Seebeck effect near the magnetic phase transition point. By means of a model calculation using a time-dependent Ginzburg-Landau equation, we have shown that in both ferromagnets and antiferromagnets, the spin Seebeck effect signal is proportional to the magnetization in the sample.

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  • Development of new spin utilization technology led by Spin Berry Phase

    Grant number:26247063  2014.04 - 2017.03

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

    Maekawa Sadamichi, YASUOKA Hiroshi, SAITOH Eiji

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    Grant amount:\33800000 ( Direct expense: \26000000 、 Indirect expense:\7800000 )

    We performed theoretical researches of novel voltage generation methods using the spin Berry phase and observation of the spin Berry phase accumulation in the nuclear spin system on the rotating frame by the nuclear magnetic resonance method. We show that the spinmotive force is enhanced by collective motion of bubble magnetic domains using numerical calculation, and show theoretically that spinmotive force is also generated by domain wall motion in antiferromagnets. In the nuclear spin system we observed the effective magnetic field induced by rotation (Barnett field) and crossover behavior between the Berry phase and the Barnett field.

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  • Research on the thermal spin current generation

    Grant number:22740210  2010.04 - 2014.03

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

    ADACHI Hiroto

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    Grant amount:\2730000 ( Direct expense: \2100000 、 Indirect expense:\630000 )

    The spin Seebeck effect refers to the generation of a spin voltage caused by a temperature gradient in a ferromagnet, which enables the thermal injection of spin currents from the ferromagnet into an adjacent nonmagnetic metal over a macroscopic scale of several millimeters. The inverse spin Hall effect converts the injected spin current into a transverse charge voltage, thereby producing electromotive force as in the conventional charge Seebeck device. The basic mechanism of the spin Seebeck effect has been theoretically investigated in this project, and it has been shown that non-equilibrium magnons and phonons play crucial roles in the spin Seebeck effect.

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  • Controlled electronic phases of transition metal oxides

    Grant number:19204035  2007 - 2010

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

    MAEKAWA Sadamichi, MORI Michiyasu, IEDA Junichi, ADACHI Hiroto, OHE Junichiro, KUBO Katsunori, ONISHI Hiroaki, KOSHIBAE Wataru

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    Grant amount:\38350000 ( Direct expense: \29500000 、 Indirect expense:\8850000 )

    In the strongly correlated electron systems, various electronic phases such as superconductivity and ferromagnetism are competed. This study aims to understand such competing electronic phases in the correlated electron systems by use of numerical techniques. Magnetic semiconductors show some unique properties by a coupling between conduction electrons and magnetic ions. Due to this coupling, one needs to consider simultaneously the electronic states of semiconductors and the electrons correlation inducing the magnetism. In this study, we combine the density functional theory for the electronic states of semiconductors and the quantum Monte Carlo method to include the correlation effects of magnetic ions. Furthermore, the thermoelectric power in the correlated electron systems is clarified by the dynamical mean-field theory.

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  • Spin current and electromotive force due to domain wall motion

    Grant number:19048009  2007 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Priority Areas

    MAEKAWA Sadamichi, MORI Michiyasu, IEDA Junichi, ADACHI Hiroto, TAKAHASHI Saburo, OHE Junichiro

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    Grant amount:\13400000 ( Direct expense: \13400000 )

    The aims of this study are to establish the quantum mechanical basis for "spinmotive force," a new mechanism of generating an electric voltage by domain wall dynamics, and to propose new concepts in magnetic devices based on this effect. We developed numerical algorisms for calculating the spinmotive force in arbitrary magnetic nanostructures and clarified the relationship between magnetization dynamics and induced spinmotive force. We analyzed spinmotive forces induced by a gyrating magnetic vortex, domain wall motion in a nonuniform nanowire, and ferromagnetic resonance in an asymmetric magnetic thin film. We also proposed a new concept of a magnetic read-head based on the spinmotive force.

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  • 強相関電子系物質で見られる新しい超伝導状態の理論的研究

    Grant number:18740205  2006 - 2007

    日本学術振興会  科学研究費助成事業  若手研究(B)

    安立 裕人

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    Grant amount:\1400000 ( Direct expense: \1400000 )

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