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Many functional materials are designed at the multiscale level. To properly simulate their physical properties, large and sophisticated computer models capable of replicating the microstructure with nm-level accuracy are required. This is the case for permanent magnets, for which there is a long-standing problem of a significant offset between simulated and experimental coercivity. To overcome this problem and resolve the Brown paradox, we developed a novel approach to construct large-scale finite element models based on the microstructure tomography. It was applied to ultrafine-grained Nd-Fe-B magnets for which, besides the shape, size, and packing of the grains, we reconstructed individual regions of thin intergranular phase separated by triple junctions. Such micromagnetic model managed to reproduce not only experimental coercivity but also its mechanism according to the angular dependence of coercivity. Furthermore, a remarkable role of thin triple junctions as nucleation centers for magnetization reversa

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Hard magnets, Digital Twin

刊行年月日: 2024-02-12

出版者: Springer Science and Business Media LLC

掲載誌:

• npj Computational Materials (ISSN: 20573960) vol. 10 issue. 1 34

研究助成金:

• Ministry of Education, Culture, Sports, Science and Technology JPMXP1122715503
• Ministry of Education, Culture, Sports, Science and Technology JPMXP1122715503
• Ministry of Education, Culture, Sports, Science and Technology JPMXP1122715503
• Ministry of Education, Culture, Sports, Science and Technology JPMXP1122715503
• Ministry of Education, Culture, Sports, Science and Technology JPMXP1122715503
• Ministry of Education, Culture, Sports, Science and Technology JPMXP1122715503
• Ministry of Education, Culture, Sports, Science and Technology JPMXP1122715503
• MEXT | Japan Society for the Promotion of Science JP23H01674
• MEXT | Japan Society for the Promotion of Science JP23H01674
• MEXT | Japan Society for the Promotion of Science JP23H01674
• MEXT | Japan Society for the Promotion of Science JP23H01674
• MEXT | Japan Society for the Promotion of Science JP23H01674
• MEXT | Japan Society for the Promotion of Science JP23H01674
• MEXT | Japan Society for the Promotion of Science JP23H01674

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41524-024-01218-5

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更新時刻: 2024-10-21 12:30:52 +0900

MDRでの公開時刻: 2024-10-21 12:30:52 +0900