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Perspectives of stochastic micromagnetism of Nd2Fe14B and computation of thermally activated process

Scripta Materialia 154, 259 (2018)

2018年9月1日(土)

Seiji Miyashita, Masamichi Nishino, Yuta Toga, Taichi Hinokihara, Takashi Miyake, SatoshiHirosawa and Akimasa Sakuma ( https://doi.org/10.1016/j.scriptamat.2017.11.012 )

Abstract

The thermal and dynamical properties Nd2Fe14B at finite temperatures are studied with anatomic model Hamiltonian.The temperature dependence of the magnetization including thereorientation transition was obtained successfully.Moreover, the atom-specific observationrevealed that the Nd magneticmoment decreases fastwith the temperature. Temperaturedependence of the domain wall structures was also obtained. Beside the static thermalproperties, dynamics of the magnetization in unfavorable magnetic field was studied bystochastic LLG equation and Monte Carlo method. The field and size-dependences of therelaxation time at finite temperatures are discussed including the effects of the dipole-dipoleinteraction.

その他特記事項

 The present work was supported by the Elements Strategy Initiative Center for Magnetic Materials under the outsourcing project of MEXT. The authors thank the Supercomputer Center, Institute for Solid State Physics, The University of Tokyo, for the use of the facilities.


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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