Atomistic-model study of temperature-dependent domain walls in the neodymium permanent magnet Nd2Fe14 B

Masamichi Nishino, Yuta Toga, Seiji Miyashita, Hisazumi Akai, Akimasa Sakuma, Satoshi Hirosawa

研究成果: Article査読

24 被引用数 (Scopus)

抄録

We studied the properties of domain walls (DWs) of the Neodymium magnet, Nd2Fe14B. Applying an atomistic model, in which the magnetic moments of all atoms and exchange interactions were determined by a first-principles calculation (Korringa-Kohn-Rostoker Green's function method), we performed a Monte Carlo simulation for two types of DW, i.e., moving along the a axis and along the c axis, which are classified into a Bloch-type wall and a Neel-type wall, respectively. We found that the shapes of the DWs of both types are described well by those derived from the continuum model used in micromagnetics. We show that the estimated DW widths are very close to the experimentally evaluated ones. Furthermore, we discovered that the width of the latter type is smaller than that of the former type. We also investigated the temperature dependence of the DW width and found that at higher temperatures it becomes larger and the magnitude of the magnetization becomes smaller, which agrees with experimental observations.

本文言語English
論文番号094429
ジャーナルPhysical Review B
95
9
DOI
出版ステータスPublished - 2017 3 28

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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