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Exploration of quantum transport phenomena utilizing magnetic fluctuations of non-collinear spin textures

Research Project

Project/Area Number 22K14011
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 InstitutionInstitute of Physical and Chemical Research

Principal Investigator

Fujishiro Yukako  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, 基礎科学特別研究員 (00883646)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2022: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Keywordsらせん磁性 / スピン揺らぎ / 電荷輸送特性 / 超高圧 / 収束イオンビーム加工 / 量子臨界 / スピン / トポロジカル / 相転移 / インダクタ / ベリー位相 / 収束イオンビーム
Outline of Research at the Start

本研究では、電子スピンが固体中で作る非共面的な構造(立体角を張る)とその揺らぎを制御し、新たな電気輸送特性の探索を行う。特に、螺旋スピン構造の電流駆動がもたらすインダクタンス効果や、磁性が外部パラメーター(圧力など)の制御によってゼロ温度で消失する量子相転移近傍での輸送特性に着目する。従来の研究で着目されてきた静的な長距離秩序の枠組みを超えて、スピン構造のダイナミクスがもたらす新規現象についての学術的理解を深めることを目指す。

Outline of Final Research Achievements

In this study, we focused on non-collinear magnetic structures such as helical magnetism and explored new charge transport properties using spin dynamics. Specifically, by investigating the quantum phase transition of helical magnetism and skyrmions under ultra-high pressure, we discovered a peculiar anomalous Hall effect that breaks time-reversal symmetry with only short-range magnetic correlations in regions where quantum fluctuations are developed. Additionally, we explored emergent inductors driven by current-induced spin dynamics and observed novel complex sign changes depending on the microscopic magnetic structures.

Academic Significance and Societal Importance of the Research Achievements

絶対零度近傍における量子揺らぎを利用した新規な異常ホール効果の発見は、これまで強磁性・反強磁性などの単純な磁気構造に注目してきた量子相転移の研究をより多彩な磁気構造に拡張するという点で学術的意義があると考えられる。また、電流駆動スピンダイナミクスによる創発電場の発生は、インダクタ素子の微細化への応用が期待できるため、電子デバイスの小型化に貢献することが期待される。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (19 results)

All 2024 2023 2022 Other

All Int'l Joint Research (1 results) Journal Article (6 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 4 results,  Open Access: 4 results) Presentation (12 results) (of which Int'l Joint Research: 7 results,  Invited: 6 results)

  • [Int'l Joint Research] Paul Scherrer Institut (PSI)(スイス)

    • Related Report
      2022 Research-status Report
  • [Journal Article] Topological stability of spin textures in Si/Co-doped helimagnet FeGe2024

    • Author(s)
      Guang Yao、Fujishiro Yukako、Tanaka Aito、Peng Licong、Kaneko Yoshio、Kanazawa Naoya、Tokura Yoshinori、Yu Xiuzhen
    • Journal Title

      Journal of Physics: Materials

      Volume: 7 Issue: 2 Pages: 025009-025009

    • DOI

      10.1088/2515-7639/ad2ec4

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Transition between distinct hybrid skyrmion textures through their hexagonal-to-square crystal transformation in a polar magnet2023

    • Author(s)
      Singh Deepak、Fujishiro Yukako、Hayami Satoru、Moody Samuel H.、Nomoto Takuya、Baral Priya R.、Ukleev Victor、Cubitt Robert、Steinke Nina-Juliane、Gawryluk Dariusz J.、Pomjakushina Ekaterina、Onuki Yoshichika、Arita Ryotaro、Tokura Yoshinori、Kanazawa Naoya、White Jonathan S.
    • Journal Title

      Nature Communications

      Volume: 14 Issue: 1 Pages: 8050-8050

    • DOI

      10.1038/s41467-023-43814-x

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Direct observations of the spin fluctuations in hedgehog-anti-hedgehog spin lattice states in MnSi1-xGex (x = 0.6 and x = 0.8)2023

    • Author(s)
      Seno Aji, Tatsuro Oda, Yukako Fujishiro, Naoya Kanazawa, Hiraku Saito, Hitoshi Endo, Masahiro Hino, Shinichi Itoh, Taka-hisa Arima, Yoshinori Tokura, and Taro Nakajima
    • Journal Title

      Phys. Rev. B

      Volume: 108 Issue: 5 Pages: 054445-054445

    • DOI

      10.1103/physrevb.108.054445

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Direct observations of spin fluctuations in spin-hedgehog-anti-hedgehog lattice states in MnSi1-xGex (x = 0.6 and 0.8) at zero magnetic field2023

    • Author(s)
      S. Aji, T. Oda, Y. Fujishiro, N. Kanazawa, H. Saito, H. Endo, M. Hino, S. Itoh, T. Arima, Y. Tokura, T. Nakahima
    • Journal Title

      arXiv

      Volume: -

    • Related Report
      2022 Research-status Report
    • Open Access
  • [Journal Article] Topological magnetic structures in MnGe: Neutron diffraction and symmetry analysis2023

    • Author(s)
      Pomjakushin V.、Plokhikh I.、White J. S.、Fujishiro Y.、Kanazawa N.、Tokura Y.、Pomjakushina E.
    • Journal Title

      Physical Review B

      Volume: 107 Issue: 2 Pages: 1-13

    • DOI

      10.1103/physrevb.107.024410

    • Related Report
      2022 Research-status Report
  • [Journal Article] Topological Phase Transitions and Critical Phenomena Associated with Unwinding of Spin Crystals by High Magnetic Fields2022

    • Author(s)
      Kanazawa Naoya、Fujishiro Yukako、Akiba Kazuto、Kurihara Ryosuke、Mitamura Hiroyuki、Miyake Atsushi、Matsuo Akira、Kindo Koichi、Tokunaga Masashi、Tokura Yoshinori
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 91 Issue: 10 Pages: 101002-101002

    • DOI

      10.7566/jpsj.91.101002

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Topological phase transitions in chiral magnets explored under extreme conditions2024

    • Author(s)
      Y. Fujishiro
    • Organizer
      The 1st U-Tokyo ISSP・RIKEN CEMS Collaboration Workshop
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Anomalous charge transport upon quantum melting of chiral spin order in FeGe2024

    • Author(s)
      Y. Fujishiro, C. Terakura, A. Miyake, N. Kanazawa, K. Nakazawa, N. Ogawa, H. Kadobayashi, S. Kawaguchi, T. Kagayama, M. Tokunaga, Y. Kato, Y. Motome, K. Shimizu, and Y. Tokura
    • Organizer
      CEMS Symposium on Emergent Quantum Materials 2024
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Topological phase transitions in chiral magnets2023

    • Author(s)
      Y. Fujishiro
    • Organizer
      2023 MRS Fall Meeting
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] カイラルらせん磁性体FeGeにおける 圧力誘起量子相転移と異常な磁気輸送現象2023

    • Author(s)
      藤代有絵子, 寺倉千恵子, 三宅厚志, 金澤直也, 仲澤一輝, 小川直毅, 門林和宏, 川口沙織, 加賀山朋子, 徳永将史, 加藤康之, 求幸年, 清水克哉, 十倉好紀
    • Organizer
      第64回高圧討論会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Giant electronic responses from emergent magnetic monopoles in chiral magnets2023

    • Author(s)
      Y. Fujishiro
    • Organizer
      2023 Gordon Research Seminar (Topological and Correlated Matter)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Pressure-induced chiral-spin ground state and unusual magneto-transport properties in FeGe above its quantum phase transition2023

    • Author(s)
      Y. Fujishiro, C. Terakura, A. Miyake, M. Tokunaga, N. Kanazawa, N. Ogawa, K. Shimizu, Y. Tokura
    • Organizer
      2023 Gordon Research Conference (Topological and Correlated Matter)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Nanoscale quantum inductor in helical-spin magnets: latest material discoveries and future perspective2023

    • Author(s)
      Y. Fujishiro
    • Organizer
      2023 MRS Spring Meeting
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Quantum phase transition and magneto-transport properties in a chiral helimagnet FeGe under high pressure2023

    • Author(s)
      Y. Fujishiro, C. Terakura, A. Miyake, M. Tokunaga, N. Kanazawa, N. Ogawa, K. Shimizu, Y. Tokura
    • Organizer
      APS March Meeting 2023
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Emergent transport phenomena and phase transitions in topological chiral magnets2022

    • Author(s)
      Y. Fujishiro
    • Organizer
      Workshop on topology in magnetic materials
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Versatile topological spin textures and emergent transport phenomena in pressure controlled cubic chiral magnets2022

    • Author(s)
      Y. Fujishiro
    • Organizer
      Symposium on Quantum Material Synthesis 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] カイラルらせん磁性体FeGeにおける 圧力誘起量子相転移と多彩な磁気輸送現象2022

    • Author(s)
      藤代有絵子, 寺倉千恵子, 三宅厚志, 徳永将史, 金澤直也, 小川直毅, 清水克哉, 十倉好紀
    • Organizer
      第63回高圧討論会
    • Related Report
      2022 Research-status Report
  • [Presentation] Quantum phase transition and magneto-transport properties of a chiral helimagnet FeGe under pressure2022

    • Author(s)
      Y. Fujishiro, C. Terakura, A. Miyake, M. Tokunaga, N. Kanazawa, K. Shimizu, Y. Tokura
    • Organizer
      29th International Conference on LOW TEMPERATURE PHYSICS
    • Related Report
      2022 Research-status Report

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Published: 2022-04-19   Modified: 2025-01-30  

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