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Electron Theory on Grain-Boundary Structures and Local Magnetic Properties of Neodymium Magnets

Mater. Trans. 59, 332 (2018).

Yoshihiro Gohda, Yasutomi Tatetsu, and Shinji Tsuneyuki ( https://doi.org/10.2320/matertrans.M2017258 )

Abstract

A fundamental understanding of microstructures is indispensable in improving neodymiummagnets performance at high temperatures. Thus, it is of significant importance to clarify atomic structures and local magnetic properties of interphase interfaces in microstructures, based on electron theory. We studied interfaces between the main phase of neodymium magnets, Nd2Fe14B, and a subphase NdOx using mas- sively parallel first-principles electronic-structure calculations with the K computer. As well as the known Cu-addition effect on wettability improvement in metallic Nd subphase, we recognized that some of the added Cu atoms at the (001) interface improve the local magnetic an- isotropy of Nd at the interface. Furthermore, we found that the substitution of Fe in the (001)-surface of mainphase grains with Zn can also improve the stability of magnetic anisotropy.

その他特記事項

CDMSI, K Computer


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文部科学省

文部科学省
元素戦略プロジェクト(活動紹介)
NIMS磁石パートナーシップ

元素戦略拠点

触媒・電池元素戦略拠点
触媒・電池元素戦略研究拠点 (京都大学)
東工大元素戦略拠点
東工大元素戦略拠点 (東京工業大学)
構造材料元素戦略研究拠点
構造材料元素戦略研究拠点 (京都大学)
高効率モーター用磁性材料技術研究組合
高効率モーター用 磁性材料技術研究組合