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Synthesis of Chiral Crystal Thin Films and Exploration of Chiral Spintronics

Research Project

Project/Area Number 22K18965
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 29:Applied condensed matter physics and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Kanazawa Naoya  東京大学, 生産技術研究所, 准教授 (10734593)

Project Period (FY) 2022-06-30 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2023: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2022: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Keywordsキラリティ / トポロジー / スピントロニクス / スピン軌道相互作用 / スキルミオン / スピン軌道トルク / キラル結晶薄膜 / FeSi / リザバーコンピューティング / 非線形ホール効果 / 反対称的スピン軌道相互作用
Outline of Research at the Start

導線を巻き付けたコイルは19世紀の最大の発明の1つとも言える。コイルの誕生によって、電磁誘導による発電、インダクタ、非接触充電や長距離通信といった様々な機能に繋がり、抵抗素子やキャパシタ素子と共に現在のエレクトロニクスを支える基盤素子を成している。コイルの電磁機能はらせん構造のキラルな対称性に由来している。抵抗やキャパシタは構成する物質中の量子状態を設計することで現代的な新しい機能が発明されているが、コイルはまだ古典的な構造のままである。本研究はミクロなコイルであるキラルな結晶構造に注目することで、コイル機能に量子物理の概念を導入し、新スピン機能物性「キラルスピントロニクス」を創出する。

Outline of Final Research Achievements

We have focused on the synthesis of chiral material thin films and the development of their spintronics functionalities. In particular, we successfully synthesized epitaxial thin films of FeSi with a cubic chiral crystal structure, discovering new properties and functionalities such as the manifestation of room temperature ferromagnetism on the surface, current-induced magnetization switching at room temperature without an external magnetic field, skyrmion formation, and higher-order nonlinear Hall effects applicable to reservoir computing. In addition, we observed the emergent inductance effect in helimagnetic materials. We also scrutinized the stability of skyrmions with impurity doping. Based on these results, we could demonstrate the significant potential of chiral materials in spintronics applications.

Academic Significance and Societal Importance of the Research Achievements

キラル結晶やらせん磁性を利用して、概要に示したような様々なスピントロニクス機能を開拓することができた。一連の成果は6件の論文として出版し、さらに1件の日本語解説記事を執筆することができた。中でも、地球上にありふれた元素である鉄とシリコンの化合物であるFeSi薄膜において発見した電流誘起磁化スイッチング現象や高次非線形ホール効果は、MRAMやリザバーコンピューティングなどへの持続可能な応用可能性を示した顕著な例となっている。今後も本研究で得られた知見を発展させることによって、基礎学理の構築やさらなる応用への発展研究が期待できる。

Report

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

    (21 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: 6 results,  Open Access: 1 results) Presentation (11 results) (of which Int'l Joint Research: 5 results,  Invited: 5 results) Remarks (2 results) Patent(Industrial Property Rights) (1 results)

  • [Int'l Joint Research] Paul Scherrer Institute(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] Molecular beam epitaxy of superconducting FeSexTe1-x thin films interfaced with magnetic topological insulators2024

    • Author(s)
      Sato Yuki、Nagahama Soma、Belopolski Ilya、Yoshimi Ryutaro、Kawamura Minoru、Tsukazaki Atsushi、Kanazawa Naoya、Takahashi Kei S.、Kawasaki Masashi、Tokura Yoshinori
    • Journal Title

      Physical Review Materials

      Volume: 8 Issue: 4

    • DOI

      10.1103/physrevmaterials.8.l041801

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Strongly pinned skyrmionic bubbles and higher-order nonlinear Hall resistances at the interface of Pt/FeSi bilayer2024

    • Author(s)
      Hori T.、Kanazawa N.、Matsuura K.、Ishizuka H.、Fujiwara K.、Tsukazaki A.、Ichikawa M.、Kawasaki M.、Kagawa F.、Hirayama M.、Tokura Y.
    • Journal Title

      Physical Review Materials

      Volume: 8 Issue: 4 Pages: 044407-044407

    • DOI

      10.1103/physrevmaterials.8.044407

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [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] Doping control of magnetism and emergent electromagnetic induction in high-temperature helimagnets2023

    • Author(s)
      Kitaori Aki、White Jonathan S.、Kanazawa Naoya、Ukleev Victor、Singh Deepak、Furukawa Yuki、Arima Taka-hisa、Nagaosa Naoto、Tokura Yoshinori
    • Journal Title

      Physical Review B

      Volume: 107 Issue: 2 Pages: 024406-024406

    • DOI

      10.1103/physrevb.107.024406

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A Noble‐Metal‐Free Spintronic System with Proximity‐Enhanced Ferromagnetic Topological Surface State of FeSi above Room Temperature2022

    • Author(s)
      Hori Tomohiro、Kanazawa Naoya、Hirayama Motoaki、Fujiwara Kohei、Tsukazaki Atsushi、Ichikawa Masakazu、Kawasaki Masashi、Tokura Yoshinori
    • Journal Title

      Advanced Materials

      Volume: 35 Issue: 3 Pages: 2206801-2206801

    • DOI

      10.1002/adma.202206801

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] キラル結晶におけるトポロジカルスピン構造形成と創発電磁物性の研究2024

    • Author(s)
      金澤 直也
    • Organizer
      日本物理学会2024年春季大会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] FeSexTe1-x thin films as a platform for exploring exotic superconducting states2024

    • Author(s)
      Yuki Sato, Soma Nagahama, Ilya Belopolski, Ryutaro Yoshimi, Minoru Kawamura, Atsushi Tsukazaki, Naoya Kanazawa, Akiyoshi Yamada, Masashi Tokunaga, Kei S Takahashi, Masashi Kawasaki, Yoshinori Tokura
    • Organizer
      APS March Meeting 2024
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A Noble-Metal-Free Spintronic System with Ferromagnetic Topological Surface State of FeSi above Room Temperature2023

    • Author(s)
      T. Hori, N. Kanazawa, M. Hirayama, K. Fujiwara, A. Tsukazaki, M. Ichikawa, M. Kawasaki, and Y. Tokura
    • Organizer
      第84回応用物理学会秋季学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] MBE成長させたFe(Se,Te)薄膜における電子相図2023

    • Author(s)
      永濱壮真, 佐藤雄貴, Ilya Belopolski, 吉見龍太郎, 川村稔, 塚﨑敦, 金澤直也, 高橋圭, 川崎雅司, 十倉好紀
    • Organizer
      日本物理学会第78回年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] MBE成長させたFe(Se,Te)薄膜の上部臨界磁場測定2023

    • Author(s)
      佐藤雄貴, 永濱壮真, Ilya Belopolski, 吉見龍太郎, 川村稔, 塚﨑敦, 山田暉馨, 徳永将史, 金澤直也, 高橋圭, 川崎雅司, 十倉好紀
    • Organizer
      日本物理学会第78回年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 偏極中性子反射率測定による新規トポロジカル強磁性表面の直接観測2023

    • Author(s)
      金澤直也
    • Organizer
      東京大学物性研究所共同利用成果発表会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] FeSi における強磁性トポロジカル表面状態の発現と強スピン-軌道結合物性2023

    • Author(s)
      金澤 直也
    • Organizer
      2022年度第2回界面ナノ科学研究会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Noble-metal free spintronic system with proximity-enhanced ferromagnetic topological surface state of FeSi above room temperature2023

    • Author(s)
      T. Hori, N. Kanazawa, M. Hirayama, K. Fujiwara, A. Tsukazaki, M. Ichikawa, M. Kawasaki, Y. Tokura
    • Organizer
      American Physical Society March Meeting 2023
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Emergence of spin-orbit coupled ferromagnetic surface state derived from Zak phase in a nonmagnetic insulator FeSi2022

    • Author(s)
      Naoya Kanazawa
    • Organizer
      The 6th Asia-Pacific Conference on Semiconducting Silicides and Related Materials (APAC-SILICIDE 2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Emergence of Ferromagnetic Topological Surface State in FeSi and Nonlinear Dynamics of Magnetic Domains2022

    • Author(s)
      Naoya Kanazawa
    • Organizer
      2022 MRS Fall Meeting & Exhibit
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Noble-metal free spintronic system with proximity-enhanced topological surface-ferromagnetic state of FeSi above room temperature2022

    • Author(s)
      T. Hori, N. Kanazawa, M. Hirayama, A. Matsui, T. Nomoto, R. Arita, K. Fujiwara, A. Tsukazaki, M. Ichikawa, M. Kawasaki, Y. Tokura
    • Organizer
      29th International Conference on Low Temperature Physics
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Remarks] researchmap

    • URL

      https://researchmap.jp/n_kanazawa

    • Related Report
      2023 Annual Research Report
  • [Remarks] 金澤研究室ホームページ

    • URL

      https://sites.google.com/view/kanazawa-lab

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
  • [Patent(Industrial Property Rights)] 磁気素子2022

    • Inventor(s)
      金澤直也,大塚悠介,堀智洋,平山元昭,十倉好紀,塚﨑敦,藤原宏平
    • Industrial Property Rights Holder
      国立大学法人東京大学,国立大学法人東北大学
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2022-177723
    • Filing Date
      2022
    • Related Report
      2022 Research-status Report

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Published: 2022-07-05   Modified: 2025-01-30  

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