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

被引：24
|
作者：
Miyashita, Seiji [1 ,2 ]
Nishino, Masamichi [2 ,3 ]
Toga, Yuta [2 ]
Hinokihara, Taichi [1 ,2 ]
Miyake, Takashi [2 ,4 ]
Hirosawa, Satoshi [2 ]
Sakuma, Akimasa [2 ,5 ]
机构：
[1] Univ Tokyo, Grad Sch Sci, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan
[2] Natl Inst Mat Sci, ESICMM, Tsukuba, Ibaraki 3050047, Japan
[3] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton, Tsukuba, Ibaraki 3050044, Japan
[4] Natl Inst Adv Ind Sci & Technol, CD FMat, Tsukuba, Ibaraki 3058568, Japan
[5] Tohoku Univ, Dept Appl Phys, Sendai, Miyagi 9808579, Japan
来源：
SCRIPTA MATERIALIA | 2018年 / 154卷
关键词：
Nd2Fe14B; Atomistic model; Magnetization reversal; Stochastic LLG equation; Size dependence of coercive force at finite temperatures; GENERAL-THEORY; FE; COERCIVITY; MAGNETIZATION; NUCLEATION; DYNAMICS; SIZE; MICROSTRUCTURE; ANISOTROPY; FIELD;
D O I：
10.1016/j.scriptamat.2017.11.012
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The thermal and dynamical properties Nd2Fe14B at finite temperatures are studied with an atomic model Hamiltonian. The temperature dependence of the magnetization including the reorientation transition was obtained successfully. Moreover, the atom-specific observation revealed that the Nd magnetic moment decreases fast with the temperature. Temperature dependence of the domain wall structures was also obtained. Beside the static thermal properties, dynamics of the magnetization in unfavorable magnetic field was studied by stochastic LW equation and Monte Carlo method. The field and size-dependences of the relaxation time at finite temperatures are discussed including the effects of the dipole-dipole interaction. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：259 / 265
页数：7
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