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New development of optical spintronics: Toward realization of optical Barnett effect

Research Project

Project/Area Number 20K14420
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 InstitutionJapan Atomic Energy Agency

Principal Investigator

Nakata Koki  国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 先端基礎研究センター, 研究副主幹 (20867105)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2020: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Keywordsマグノン / スピントロニクス / マグノニクス / 磁性絶縁体 / 量子物性 / 光学物性 / 非平衡物性 / 物性理論 / 光物性 / 熱磁気物性 / 反強磁性体 / フェリ磁性体 / 巨視的量子現象 / マグノンJosephson効果 / スピン流 / マグノン輸送 / マグノン凝縮 / 量子光学 / Barnett効果 / Bose-Einstein凝縮
Outline of Research at the Start

従来の「力学的Barnett効果」を光学的に発展させた「光学的Barnett効果」の基礎学理を構築し、観測を目指す。そのために本研究は、従来の強磁性絶縁体ではなく、反強磁性・フェリ磁性絶縁体に着目する。巨視的磁化を有する強磁性体では古典的な磁気双極子相互作用が支配的となるため、GHz領域程度のスピン集団運動「マグノン」しか励起できない。一方、反強磁性・フェリ磁性体では量子力学的なスピン交換相互作用が支配的となり、THz領域・以上の高周波領域のマグノンを励起させる事が可能である。超高速スピントロニクス技術の絶好の舞台である反強磁性・フェリ磁性絶縁体の光学的スピン物性を開拓する。

Outline of Final Research Achievements

Throughout this research project, we have studied quantum optical properties of magnons in insulating magnets (e.g., antiferromagnets and ferrimagnets) and theoretically proposed the optomagnonic Barnett effect, the optomagnonic Josephson effect, and the magnonic Casimir effect.

Academic Significance and Societal Importance of the Research Achievements

反強磁性体では量子力学的なスピン交換相互作用が支配的となり、高周波のマグノン(スピン波)を励起させる事が可能である。そのため、反強磁性絶縁体中のマグノンの新たな光学物性や量子物性を理論的に明らかにした本研究成果は、超高速スピントロニクスおよび光学的スピントロニクスの基礎学理の構築に貢献し、物質の個性を活かすスピントロニクスと普遍性を追求する量子統計物理学とを紡ぐ架け橋となることが期待される。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (15 results)

All 2023 2022 2021 2020 Other

All Int'l Joint Research (4 results) Journal Article (8 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 8 results,  Open Access: 4 results) Presentation (2 results) (of which Int'l Joint Research: 1 results) Remarks (1 results)

  • [Int'l Joint Research] KAIST(韓国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Johns Hopkins University(米国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] KAIST(韓国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Max Planck Institute (Dresden)(ドイツ)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Magnonic Casimir Effect in Ferrimagnets2023

    • Author(s)
      Kouki Nakata and Kei Suzuki
    • Journal Title

      Phys. Rev. Lett.

      Volume: 130 Issue: 9 Pages: 096702-096702

    • DOI

      10.1103/physrevlett.130.096702

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Direct and alternating magnon spin currents across a junction interface irradiated by linearly polarized laser2022

    • Author(s)
      Kouki Nakata and Yuichi Ohnuma
    • Journal Title

      Phys. Rev. B

      Volume: 105 Issue: 14

    • DOI

      10.1103/physrevb.105.144436

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Violation of the magnonic Wiedemann-Franz law in the strong nonlinear regime2022

    • Author(s)
      Kouki Nakata, Yuichi Ohnuma, and Se Kwon Kim
    • Journal Title

      Phys. Rev. B

      Volume: 105 Issue: 18

    • DOI

      10.1103/physrevb.105.184409

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Optomagnonic Josephson effect in antiferromagnets2021

    • Author(s)
      Nakata Kouki
    • Journal Title

      Physical Review B

      Volume: 104 Issue: 10 Pages: 1-12

    • DOI

      10.1103/physrevb.104.104402

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Magnonic thermal transport using the quantum Boltzmann equation2021

    • Author(s)
      Nakata Kouki、Ohnuma Yuichi
    • Journal Title

      Physical Review B

      Volume: 104 Issue: 6 Pages: 1-8

    • DOI

      10.1103/physrevb.104.064408

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Topological Hall Effects of Magnons in Ferrimagnets2021

    • Author(s)
      Nakata Kouki、Kim Se Kwon
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 90 Issue: 8 Pages: 081004-081004

    • DOI

      10.7566/jpsj.90.081004

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] マグノン Wiedemann-Franz 則2021

    • Author(s)
      仲田光樹
    • Journal Title

      固体物理

      Volume: 56 Pages: 429-439

    • NAID

      40022676310

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Optomagnonic Barnett effect2020

    • Author(s)
      Kouki Nakata, Shintaro Takayoshi
    • Journal Title

      Physical Review B

      Volume: 102 Issue: 9

    • DOI

      10.1103/physrevb.102.094417

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] マグノン量子場による非エルミートカシミア効果2023

    • Author(s)
      仲田光樹
    • Organizer
      京都大学基礎物理学研究所セミナー
    • Related Report
      2022 Annual Research Report
  • [Presentation] Magnon dynamics in a Skyrmion-textured domain wall of antiferromagnets2023

    • Author(s)
      Seungho Lee, Kouki Nakata, Oleg Tchernyshyov, and Se Kwon Kim
    • Organizer
      American Physical Society March Meeting 2023
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Remarks] 磁気デバイスの小型化に重要な「磁気の波の真空に潜むエネルギー」を解明

    • URL

      https://www.jaea.go.jp/02/press2022/p23022801/

    • Related Report
      2022 Annual Research Report

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Published: 2020-04-28   Modified: 2024-01-30  

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