Anisotropy of exchange stiffness based on atomic-scale magnetic properties in the rare-earth permanent magnet Nd2Fe14 B

Yuta Toga, Masamichi Nishino, Seiji Miyashita, Takashi Miyake, Akimasa Sakuma

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We examine the anisotropic properties of the exchange stiffness constant A for a rare-earth permanent magnet, Nd2Fe14B, by connecting analyses with two different scales of length, i.e., Monte Carlo (MC) method with an atomistic spin model and Landau-Lifshitz-Gilbert (LLG) equation with a continuous magnetic model. The atomistic MC simulations are performed on the spin model of Nd2Fe14B constructed from ab initio calculations, and the LLG micromagnetics simulations are performed with the parameters obtained by the MC simulations. We clarify that the amplitude and the thermal property of A depend on the orientation in the crystal, which are attributed to the layered structure of Nd atoms and weak exchange couplings between Nd and Fe atoms. We also confirm that the anisotropy of A significantly affects the threshold field for the magnetization reversal (coercivity) given by the depinning process.

Original languageEnglish
Article number054418
JournalPhysical Review B
Volume98
Issue number5
DOIs
Publication statusPublished - 2018 Aug 17

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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