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Temperature Dependence of Threshold of Magnetic Fields for Nucleation and Domain WallPropagation.

TMS2017 146th Annual Meeting & Exhibition

2017年2月28日(火)

S. Miyashita1, M. Nishino2, ; 1 The University of Tokyo; 2 National Institute for MaterialScience

Abstract

In order to study coercive mechanism of permanent magnets at finite temperatures, westudied temperature dependence of threshold of magnetic fields for nucleation and domain wallpropagation in a sandwich structure of hard-soft-hard magnet. We found general features ofthe reduction of the threshold with the temperature.In particular, we found novel dependencesdue to the narrow domain wall effect due to the reduction of the exchange energy.We alsostudied the nucleation and domain wall propagation in a realistic modeling of Nd-Fe-B magnetsby making use of real structure and parameters which are obtained in literatures and also fromthe first-principle calculations. There we reproduced experimentally-observed properties,andalso we found some microscopic properties related to the magnetization reversal in thematerial.


研究活動

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