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High-efficient spin-charge conversion originating from real-space Berry phase of topological spin structures

Research Project

Project/Area Number 19K14667
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
Research InstitutionThe University of Tokyo (2020)
Institute of Physical and Chemical Research (2019)

Principal Investigator

Yokouchi Tomoyuki  東京大学, 大学院総合文化研究科, 助教 (20823389)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywordsスピントロニクス / スキルミオン / ベリー位相 / スピンホール効果 / トポロジー / スピン電荷変換
Outline of Research at the Start

スピンと電荷の相互変換を用いた革新的デバイスや高効率エネルギー変換の実現が期待されている。そのためには安価で高効率なスピンと電荷の相互変換の実現が必要である。一方で従来の高効率スピン電荷変換は、運動量空間ベリー位相などといったバンド構造に基づく機構が主流であり、これらの機構には白金などの高価な元素が必要である。本研究では、高価な元素がなくても巨大な実空間でのベリー位相の起源になりうることが近年明らかになた「スキルミオン」と呼ばれるトポロジカルスピン構造に着目する。そして実空間ベリー位相を用いた高効率で安価なスピン電荷変換機能の実現に向けた基礎原理の確立を目指す。

Outline of Final Research Achievements

Berry phase originating from real-space spin structures gives rise to various unique phenomena. In this study, we have investigated the spin-charge conversion phenomena related to real space Berry phase arising from topological spin structures.
We succeeded in the spin-charge conversion in magnets hosting skyrmions. Then, to further deepen our understanding of these results, we have investigated spin-charge conversion phenomena in a system with broken time-reversal symmetry. In addition, we also explored a novel method for the skyrmion creation and novel transport phenomena associated with the real-space Berry phase.

Academic Significance and Societal Importance of the Research Achievements

本研究により、スピン構造による実空間ベリー位相によって生じる輸送現象・スピン電荷変換現象への理解が深まったといえる。ベリー位相に関連した物理現象を開拓しその起源を解明していくことで、次世代のエレクトロニクスの発展へつながっていくことが期待される。また、スキルミオンは次世代メモリへの応用が期待されているため、その新たな制御方法を開拓できたことは、スキルミオンの応用へつながることが期待される。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (6 results)

All 2021 2020 2019

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (4 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results)

  • [Journal Article] Creation of magnetic skyrmions by surface acoustic waves2020

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

      Nature Nanotechnology

      Volume: 15 Issue: 5 Pages: 361-366

    • DOI

      10.1038/s41565-020-0661-1

    • Related Report
      2020 Annual Research Report 2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Emergent electromagnetic induction in a helical-spin magnet2020

    • Author(s)
      Yokouchi Tomoyuki、Kagawa Fumitaka、Hirschberger Max、Otani Yoshichika、Nagaosa Naoto、Tokura Yoshinori
    • Journal Title

      Nature

      Volume: 586 Issue: 7828 Pages: 232-236

    • DOI

      10.1038/s41586-020-2775-x

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] Observation of emergent electromagneticinduction in Gd3Ru4Al122021

    • Author(s)
      T. Yokouchi
    • Organizer
      CREST Workshop on “Physics of helical and skyrmion phases"
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Reservoir Computing using Dynamics of Magnetic Skyrmions2020

    • Author(s)
      T. Yokouchi
    • Organizer
      第 44 回 日本磁気学会学術講演会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Creation of skyrmions and control of domain wall velocity by surface acoustic waves in Pt/Co/Ir trilayer films2020

    • Author(s)
      T.Yokouchi, S.Sugimoto, B.Rana, S.Seki, N. Ogawa, S. Kasai, Y. Otani
    • Organizer
      New Perspective in Spin Conversion Science (NPSCS2020)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Creation of magnetic skyrmions by surface acoustic waves in Co/Pt/Ir trilayer films2019

    • Author(s)
      T. Yokouchi, S. Sugimoto, B. Rana, S. Seki, N. Ogawa, S. Kasai, and Y. Otani
    • Organizer
      Joint European Mangetic Symposia
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2022-01-27  

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