Abstract 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 LLG 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.

中文翻译：

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Nd 2 Fe 14 B的随机微磁性透视及热活化逆转过程的计算

摘要 利用原子模型哈密顿量研究了 Nd2Fe14B 在有限温度下的热力学和动力学性质。成功获得了磁化强度的温度依赖性，包括重新定向转变。此外，原子特异性观察表明，Nd 磁矩随温度快速下降。还获得了畴壁结构的温度依赖性。除了静态热学特性外，还通过随机LLG方程和蒙特卡罗方法研究了不利磁场中磁化强度的动力学。讨论了有限温度下弛豫时间的场和尺寸依赖性，包括偶极-偶极相互作用的影响。