Scripta Materialia 2017-12-26

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

Seiji Miyashita, Masamichi Nishino, Yuta Toga, Taichi Hinokihara, Takashi Miyake, Satoshi Hirosawa, Akimasa Sakuma

Index: 10.1016/j.scriptamat.2017.11.012

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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.

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