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Alternative title: Atomistic Model Study on Magnetic Properties of Permanent Magnets―Treatment of Thermal Fluctuation and Thermal Effects, and Future Perspective―

Description:

We review atomistic spin model studies, a new approach for theoretical investigations, on magnetic properties of permanent magnets. In the atomistic modeling, the microscopic details of magnetic parameters and lattice structures are realistically considered, and the temperature effect, including thermal fluctuation, is properly treated based on statistical physics methods: Monte Caro methods and stochastic Landau–Lifshitz–Gilbert equation methods. We introduce how to treat thermal effects for static and dynamical properties using these methods. Focusing especially on neodymium permanent magnets, we discuss features of magnetization, domain wall, coercivity of a grain, nucleation and pinning fields, and dysprosium substitution effect, which were first elucidated with those methods.

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• In Copyright
  

Keyword: 原子論的スピンモデル　, 永久磁石, 熱揺らぎ, 温度効果, 保磁力

Date published: 2023-05-01

Publisher: Japan Institute of Metals

Journal:

• Journal of the Japan Institute of Metals and Materials (ISSN: 00214876) vol. 87 issue. 5 p. 158-172

Funding:

• ESICMM JPMXP0112101004 (Element Strategy Initiative)

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.2320/jinstmet.JA202202

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Updated at: 2024-01-05 22:11:51 +0900

Published on MDR: 2023-10-18 13:30:10 +0900