Quantitative analysis of spin and orbital magnetic moments in a neodymium magnet by magnetic Compton scattering

2020 Fiscal Year Final Research Report

• Project/Area Number: 18K04686
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 26010:Metallic material properties-related
• Research Institution: Japan Synchrotron Radiation Research Institute
• Principal Investigator: Tsuji Naruki 公益財団法人高輝度光科学研究センター, 回折・散乱推進室, 研究員 (90573113)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 磁性 / 磁気コンプトン散乱 / ネオジム磁石 / 保磁力

Outline of Final Research Achievements

The purpose of this study is to quantitatively analyze the temperature dependence of the spin and orbital magnetic moments and coercivity of neodymium magnets. We measured the coercivity of the spin moment using magnetic Compton scattering and its depth dependence. As a result, we observed that the coercivity decreased near the surface due to surface degradation by mechanical cutting and polishing. We also found that the coercivity decreased slightly at the center region of the magnet due to the demagnetizing field. We also measured the temperature dependence of the spin magnetization. It showed a different temperature dependence from the total magnetization measurement measured by the VSM.

Free Research Field

磁性、放射光

Academic Significance and Societal Importance of the Research Achievements

高性能磁石は、ハイブリット自動車や電気自動車などのモータとして使用されるため、さらに高性能な磁石を開発することが求めらえれている。その開発には、磁石の磁気状態を詳細に観測することが必要不可欠であり、本研究では、磁石の詳細な磁気状態観測を行う方法を開発し、ネオジム磁石の磁気状態観測を行った。本研究での成果が、高性能磁石の開発に寄与することが期待される。