Model calculation of magnetization reversal process of hard magnet in Nd2Fe14B system

Chiharu Mitsumata, Hiroki Tsuchiura, Akimasa Sakuma

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

We propose a mechanism that exhibits the coercivity reduction of Nd-Fe-B magnets. The model employed here is a micromagnetic model involving the anisotropy- and exchange-fields obtained by using first-principles calculations. The uniqueness of this model is that it has a c-plane magnetic anisotropy around its surface, in contrast to the bulk c-axis anisotropy. We find that the local c-plane anisotropy drastically affects the coercivity, resulting in a reduction by half of the bulk anisotropy field Hk . We also find that partial substitution of Dy for Nd around the surface actually recovers the coercivity.

Original languageEnglish
Article number113002
JournalApplied Physics Express
Volume4
Issue number11
DOIs
Publication statusPublished - 2011 Nov 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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