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The study of angular momentum in ferrimagnet by using Barnett effect and NMR

Research Project

Project/Area Number 21K14529
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 29010:Applied physical properties-related
Research InstitutionJapan Atomic Energy Agency

Principal Investigator

Imai Masaki  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, 研究職 (10796329)

Project Period (FY) 2021-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2022: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2021: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywordsフェリ磁性 / 角運動量補償 / 磁気回転効果 / バーネット効果 / NMR / スピンメカトロニクス / スピントロニクス
Outline of Research at the Start

フェリ磁性体の内部角運動量が消失する角運動量補償温度では磁気応答や磁壁移動度が高速化されるため、磁気デバイスの性能向上の礎となる。申請者は力学回転と角運動量の相互作用(バーネット効果)を利用して希土類ガーネット角運動量補償温度の測定に成功した。本研究ではバーネット効果及びNMR測定を使った角運動量補償をもつ物質の探索および角運動量補償での磁気ダイナミクス現象の解明を目指す。

Outline of Final Research Achievements

Some ferrimagnetic materials, such as rare earth iron garnets, exhibit magnetic and angular momentum compensation temperatures due to the temperature dependence of the magnetization and angular momentum of antiferromagnetically coupled magnetic ions.The angular momentum compensation temperature can be obtained by using the mechanical rotation directly coupled to the angular momentum. In this study, the angular momentum compensation temperature of rare earth iron garnets was determined using the Barnett effect. In NMR measurements, we confirmed that the signal intensity is enhanced at the angular momentum compensation temperature. This is interpreted to be due to the increase in the magnetic wall mobility in angular momentum compensation, indicating that the angular momentum compensation temperature can be estimated from the NMR measurements.

Academic Significance and Societal Importance of the Research Achievements

スピントロニクスの重要な材料である希土類鉄ガーネット等のフェリ磁性体において、磁化の運動が早くなる角運動量補償温度近傍では磁気デバイスへの様々な応用が期待される。今回我々は、バーネット効果測定装置の感度および温度変化測定装置の改良を行い、さまざまなフェリ磁性体での角運動量補償の観測を可能にした。また、NMR測定の信号強度から角運動量補償温度を推定する手法を使えば、原理的により微小な試料かつ単結晶、粉末など試料形状を問わず測定可能であり、角運動量補償を示すフェリ磁性体の探索がより容易になる。

Report

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

    (2 results)

All 2022 2021

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

  • [Journal Article] Observation of the Angular Momentum Compensation by Barnett Effect and NMR2021

    • Author(s)
      Hiroyuki Chudo , Masaki Imai , Mamoru Matsuo , Sadamichi Maekawa , Eiji Saitoh
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 90 Issue: 8 Pages: 081003-081014

    • DOI

      10.7566/jpsj.90.081003

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Observation of the Angular Momentum Compensation by Barnett Effect and NMR2022

    • Author(s)
      M. Imai, H. Chudo, S. Maekawa, M. Matsuo, E. Saitoh
    • Organizer
      The 67th Annual Conference on Magnetism and Magnetic Materials(MMM 2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited

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Published: 2021-04-28   Modified: 2024-01-30  

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