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Dynamics of skyrmions and their applications to neuromorphic devices

Research Project

Project/Area Number 21H01794
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 29010:Applied physical properties-related
Research InstitutionInstitute of Physical and Chemical Research (2023)
The University of Tokyo (2021-2022)

Principal Investigator

Yokouchi Tomoyuki  国立研究開発法人理化学研究所, 創発物性科学研究センター, ユニットリーダー (20823389)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2023: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2022: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2021: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
Keywordsスキルミオン / ニューロモルフィックデバイス / 非相反伝導現象 / 物理リザバー / リザバーコンピューティング / 電流誘起スピンダイナミクス / ニューロモルフィック / 非線形ダイナミクス / ニューラルネットワーク / スピントロニクス / トポロジー
Outline of Research at the Start

近年、人工ニューラルネットワークを用いた機械学習が様々なタスクで高い性能を示すことが明らかになり、学術と経済の両面から重要性が高まっている。一方従来のデバイスでは消費電力や速度の面で課題が多い。その解決のため、物理系における非線形応答を用いるニューロモルフィックデバイスの研究が行われている。本研究では、「スキルミオン」と呼ばれるトポロジカル磁気構造に着目し、その非線形応答の特性を解明するとともに、実際にデバイスを作成し、計算性能を評価する。そして、スキルミオンのもつ物理特性と性能の関係を系統的に調べ、ニューロモルフィックデバイスの高性能化・実用化へむけた新たな指針を得ることを目指す。

Outline of Final Research Achievements

In recent years, the importance of machine learning using artificial neural networks (ANN) has rapidly increased. However, conventional devices used to run ANNs face challenges such as high power consumption. Therefore, research on devices specialized for running ANNs (artificial intelligence devices) has been advancing. Skyrmions, in particular, have garnered attention as a promising candidate. This research focused on the creation and performance evaluation of artificial intelligence devices using skyrmions, aiming to enhance their performance. Specifically, we evaluated the performance of physical reservoir devices using skyrmions and achieved high recognition rates in handwritten digit recognition. Additionally, we observed nonlinear responses in antiferromagnetic materials and Weyl semimetals, exploring their potential applications in neuromorphic devices.

Academic Significance and Societal Importance of the Research Achievements

本研究の社会的意義は、エネルギー効率の高い高性能人工知能の実現につながる可能性がある点である。従来のCPUやGPUは消費電力が大きく、メモリ機能がないため効率が低下する。スキルミオンを用いた人工知能素子は低消費電力で操作可能であり、メモリ効果を持つため計算効率を大幅に向上させる可能性を秘めている。また、スキルミオンの粒子性によりナノスケールで多数のノード形成が容易で、高密度集積回路が実現可能という利点もある。また、本研究で観測した反強磁性体やワイル半金属における非線形応答は、人工知能素子の新たな動作原理として発展してく可能性を秘めている。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (21 results)

All 2023 2022 2021

All Journal Article (13 results) (of which Peer Reviewed: 13 results,  Open Access: 6 results) Presentation (8 results) (of which Int'l Joint Research: 6 results,  Invited: 4 results)

  • [Journal Article] Modulation of spin Hall magnetoresistance in α-Fe2O3/Pt by uniaxial tensile strain2023

    • Author(s)
      Matsuki Junnosuke、Yokouchi Tomoyuki、Shiomi Yuki
    • Journal Title

      Applied Physics Express

      Volume: 16 Issue: 12 Pages: 123001-123001

    • DOI

      10.35848/1882-0786/ad0db7

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Amorphous Ferromagnetic Metal in van der Waals Materials2023

    • Author(s)
      Zhang Siyue、Harii Kazuya、Yokouchi Tomoyuki、Okayasu Satoru、Shiomi Yuki
    • Journal Title

      Advanced Electronic Materials

      Volume: 10 Issue: 2 Pages: 2300609-2300609

    • DOI

      10.1002/aelm.202300609

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Surface anisotropic magnetoresistance in the antiferromagnetic semiconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Cr</mml:mi><mml:msub><mml:mi>Sb</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>2023

    • Author(s)
      Kurea Nakagawa, Motoi Kimata, Tomoyuki Yokouchi, Yuki Shiomi
    • Journal Title

      Physical Review B

      Volume: 107 Issue: 18 Pages: 1-6

    • DOI

      10.1103/physrevb.107.l180405

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Giant Magnetochiral Anisotropy in Weyl Semimetal WTe2 Induced by Diverging Berry Curvature2023

    • Author(s)
      Yokouchi Tomoyuki、Ikeda Yuya、Morimoto Takahiro、Shiomi Yuki
    • Journal Title

      Physical Review Letters

      Volume: 130 Issue: 13 Pages: 136301-136301

    • DOI

      10.1103/physrevlett.130.136301

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Trapping and manipulating skyrmions in two-dimensional films by surface acoustic waves2023

    • Author(s)
      Miyazaki Yu、Yokouchi Tomoyuki、Shiomi Yuki
    • Journal Title

      Scientific Reports

      Volume: 13 Issue: 1 Pages: 1922-1922

    • DOI

      10.1038/s41598-023-29022-z

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Phase-change control of anomalous Hall effect in ferromagnetic MnBi thin films2022

    • Author(s)
      Zhang Siyue、Miyazaki Yu、Yokouchi Tomoyuki、Shiomi Yuki
    • Journal Title

      Applied Physics Letters

      Volume: 121 Issue: 26 Pages: 262402-262402

    • DOI

      10.1063/5.0121284

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Pattern recognition with neuromorphic computing using magnetic field-induced dynamics of skyrmions2022

    • Author(s)
      Yokouchi Tomoyuki、Sugimoto Satoshi、Rana Bivas、Seki Shinichiro、Ogawa Naoki、Shiomi Yuki、Kasai Shinya、Otani Yoshichika
    • Journal Title

      Science Advances

      Volume: 8 Issue: 39 Pages: 1-7

    • DOI

      10.1126/sciadv.abq5652

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Quantum oscillations from Fermi arc surface states in Cd3As2 submicron wires2022

    • Author(s)
      Yu Miyazaki, Tomoyuki Yokouchi, Kiyou Shibata, Yao Chen, Hiroki Arisawa, Teruyasu Mizoguchi, Eiji Saitoh, and Yuki Shiomi
    • Journal Title

      Phys. Rev. Research

      Volume: 4 Issue: 2

    • DOI

      10.1103/physrevresearch.4.l022002

    • Related Report
      2022 Annual Research Report 2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Enhancement of Current-Induced Out-of-Plane Spin Polarization by Heavy-Metal-Impurity Doping in Fe Thin Films2021

    • Author(s)
      Yokouchi T.、Shiomi Y.
    • Journal Title

      Physical Review Applied

      Volume: 16 Issue: 5 Pages: 054001-054001

    • DOI

      10.1103/physrevapplied.16.054001

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Reconfigurable single-material Peltier effect using magnetic-phase junctions2021

    • Author(s)
      Nakagawa Kurea、Yokouchi Tomoyuki、Shiomi Yuki
    • Journal Title

      Scientific Reports

      Volume: 11 Issue: 1 Pages: 24216-24216

    • DOI

      10.1038/s41598-021-03754-2

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Anisotropic magneto-Seebeck effect in the antiferromagnetic semimetal FeGe22021

    • Author(s)
      Hashizume Minori、Yokouchi Tomoyuki、Nakagawa Kurea、Shiomi Yuki
    • Journal Title

      Physical Review B

      Volume: 104 Issue: 11 Pages: 115109-115109

    • DOI

      10.1103/physrevb.104.115109

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Enhanced electrical magnetochiral effect by spin-hedgehog lattice structural transition2021

    • Author(s)
      Kitaori A.、Kanazawa N.、Ishizuka H.、Yokouchi T.、Nagaosa N.、Tokura Y.
    • Journal Title

      Physical Review B

      Volume: 103 Issue: 22

    • DOI

      10.1103/physrevb.103.l220410

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Emergent electromagnetic induction beyond room temperature2021

    • Author(s)
      Kitaori Aki、Kanazawa Naoya、Yokouchi Tomoyuki、Kagawa Fumitaka、Nagaosa Naoto、Tokura Yoshinori
    • Journal Title

      Proceedings of the National Academy of Sciences

      Volume: 118 Issue: 33 Pages: 1-6

    • DOI

      10.1073/pnas.2105422118

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Pattern recognition with reservoir computing using magnetic-field induced dynamics of skyrmions2023

    • Author(s)
      T. Yokouchi
    • Organizer
      20th RIEC International Workshop
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Giant Magnetochiral Anisotropy in Weyl-semimetal WTe2 Induced by Diverging Berry Curvature2023

    • Author(s)
      T. Yokouchi
    • Organizer
      The 7th Symposium for the Core Research Clusters for Materials Science and Spintronics and the 6th Symposium on International Joint Graduate Program in Materials Science and Spintronics
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Thermal and quantum dynamics of magnetic skyrmions for novel computing2023

    • Author(s)
      T. Yokouchi
    • Organizer
      German-Japanese workshop
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Emergent electric field induced by current-driven domain wall motion in a room-temperature antiferromagnet FeSn22023

    • Author(s)
      T.Yokouchi, Y. Yamane, Y. Araki, J. Ieda, Y. Shiomi
    • Organizer
      CEMS symposium on emergent quantum materials
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Pattern recognition with neuromorphic computing using magnetic-field induced dynamics of skyrmions2023

    • Author(s)
      T. Yokouchi, S. Sugimoto, B. Rana, S. Seki, N. Ogawa, Y. Shiomi S. Kasai, and Y. Otani
    • Organizer
      American Physical Society March Meeting
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] スキルミオンの磁場誘起ダイナミクスを用いた脳型計算2022

    • Author(s)
      横内智行, 杉本聡志, ラナビヴァス, 関真一郎, 小川直毅, 塩見雄毅, 葛西伸哉, 大谷義近
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Emergent electromagnetic induction in a helical-spin magnet2022

    • Author(s)
      T. Yokouchi
    • Organizer
      The 24th International Colloquium on Magnetic Films and Surfaces (ICMFS-2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Fe薄膜における重金属不純物ドープによる 電流誘起面直スピン偏極の増大2022

    • Author(s)
      横内智行 塩見雄毅
    • Organizer
      日本物理学会 第77回年次大会
    • Related Report
      2021 Annual Research Report

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Published: 2021-04-28   Modified: 2025-01-30  

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