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Critical fluctuations in topological transitions of spin structures and their application to high efficiency thermoelectric conversion

Research Project

Project/Area Number 18K13497
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

Principal Investigator

Kanazawa Naoya  東京大学, 大学院工学系研究科(工学部), 講師 (10734593)

Project Period (FY) 2018-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywordsスキルミオン / ヘッジホッグ / トポロジカル相転移 / 小角中性子散乱 / キラル磁性体 / 熱電効果 / 臨界ゆらぎ
Outline of Final Research Achievements

Many electron spins in a material behave as small magnets. These spins show various collective structures. When a spin structure with characteristic topological properties, such as skyrmion, is realized, there appears a huge electromagnetic response, which cannot be realized by classical electromagnetism. In this research, we developed chiral magnets and identified new topological spin structures called spin-hedgehog lattices. Those topological spin structures can be transformed into other structures by external stimuli such as a magnetic field and pressure. We also found giant Hall responses in association with the strong spin fluctuations upon the topological phase transition.

Academic Significance and Societal Importance of the Research Achievements

2009年にスキルミオンという新しいスピン構造が発見されて以降、様々なタイプのトポロジカルスピン構造が発見されてきました。それらはナノメートルスケールの磁気粒子として振舞うため、磁気記録メモリの性能を向上させる物質中の状態として注目を集めました。本研究では、トポロジカルスピン構造を磁場や圧力といった外部刺激によって自在に変形させることができ、その変形(トポロジカル相転移)に伴うスピンの強いゆらぎが電気伝導現象に大きな影響を与えるという新しい物理の側面を明らかにできました。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (15 results)

All 2020 2019 2018 Other

All Int'l Joint Research (2 results) Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (7 results) (of which Int'l Joint Research: 5 results,  Invited: 5 results) Remarks (2 results)

  • [Int'l Joint Research] Paul Scherrer Institute/Ecole Polytechnique Federale de Lausanne(スイス)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Paul Scherrer Institute/Ecole Polytechnique Federale de Lausanne(スイス)

    • Related Report
      2018 Research-status Report
  • [Journal Article] Determination of crystallographic chirality of MnSi thin film grown on Si (111) substrate2020

    • Author(s)
      Morikawa Daisuke、Yamasaki Yuichi、Kanazawa Naoya、Yokouchi Tomoyuki、Tokura Yoshinori、Arima Taka-hisa
    • Journal Title

      Physical Review Materials

      Volume: 4 Issue: 1 Pages: 014407-014407

    • DOI

      10.1103/physrevmaterials.4.014407

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Engineering skyrmions and emergent monopoles in topological spin crystals2020

    • Author(s)
      Y. Fujishiro, N. Kanazawa, and Y. Tokura
    • Journal Title

      Applied Physics Letters

      Volume: 116 Issue: 9 Pages: 1-7

    • DOI

      10.1063/1.5139488

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Topological transitions among skyrmion- and hedgehog-lattice states in cubic chiral magnets2019

    • Author(s)
      Y. Fujishiro, N. Kanazawa, T. Nakajima, X. Z. Yu, K. Ohishi, Y. Kawamura, K. Kakurai, T. Arima, H. Mitamura, A. Miyake, K. Akiba, M. Tokunaga, A. Matsuo, K. Kindo, T. Koretsune, R. Arita, Y. Tokura
    • Journal Title

      Nature Communications

      Volume: 10 Issue: 1 Pages: 1-8

    • DOI

      10.1038/s41467-019-08985-6

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] トポロジカル磁性体の創発物性・機能2018

    • Author(s)
      金澤 直也、十倉 好紀
    • Journal Title

      まぐね

      Volume: 13 Pages: 289-298

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] Formation of spin-hedgehog lattices and giant topological transport properties in chiral magnets2020

    • Author(s)
      Naoya Kanazawa
    • Organizer
      DPG Spring Meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Deformation of spin-hedgehog lattice in chiral magnet MnGe as seen via small-angle neutron scattering2019

    • Author(s)
      N. Kanazawa, J. S. White, H. M. Ronnow, A. Tsukazaki, M. Ichikawa, M. Kawasaki, Y. Tokura
    • Organizer
      CEMS Symposium on Emergent Quantum Materials
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 小角中性子散乱から見たカイラル磁性体 MnGeのスピンヘッジホッグ格子の変形過程2019

    • Author(s)
      金澤直也, Jonathan White, Henrik Ronnow, 塚﨑敦, 市川昌和, 川﨑雅司, 十倉好紀
    • Organizer
      日本物理学会2019年秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Emergent Phenomena and Functionality in Topological Magnets2019

    • Author(s)
      N. Kanazawa
    • Organizer
      日本磁気学会第43回学術講演会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Various topological spin structures and emergent transport phenomena in B20-type chiral magnets2018

    • Author(s)
      Naoya Kanazawa
    • Organizer
      Quantum Complex Matter 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] B20型キラル磁性体における多彩な磁気構造と創発物性2018

    • Author(s)
      金澤 直也
    • Organizer
      基研研究会 スピン系物理の最前線
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Various topological spin textures and emergent transport phenomena in B20-type chiral magnets2018

    • Author(s)
      Naoya Kanazawa
    • Organizer
      2018 MRS Fall Meeting & Exhibit
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks] researchmap

    • URL

      https://researchmap.jp/n_kanazawa

    • Related Report
      2019 Annual Research Report
  • [Remarks] researchmap

    • URL

      https://researchmap.jp/n_kanazawa/?lang=japanese

    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2021-02-19  

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