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Quantum theory of rare-earth magnets

J. Phys. Soc. Jpn. 87, 041009 (2018)

2018年1月29日(月)

Takashi Miyake and Hisazumi Akai

Abstract

Strong permanent magnets mainly consist of rare earths (R) and transition metals (T). Themain phase of the neodymium magnet, which is the strongest magnet, is Nd2Fe14B.Sm2Fe17N3 is another magnet compound having excellent magnetic propertiescomparable to those of Nd2Fe14B. Their large saturation magnetization, strongmagnetocrystalline anisotropy, and high Curie temperature originate from the interactionbetween the T-3d electrons and R-4f electrons. This article discusses the magnetism ofrare-earth magnet compounds. The basic theory and first-principles calculationapproaches for quantitative description of the magnetic properties are presented, togetherwith applications to typical compounds such as Nd2Fe14B, Sm2Fe17N3, and the recentlysynthesized NdFe12N. 

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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