Micromagnetic simulations on the grain size dependence of coercivity in anisotropic Nd-Fe-B sintered magnets

H. Sepehri-Amin, T. Ohkubo, M. Gruber, T. Schrefl, K. Hono

Research output: Contribution to journalArticlepeer-review

102 Citations (Scopus)

Abstract

Micromagnetic simulations of magnetization reversals of Nd-Fe-B anisotropic magnets with exchange-coupled grains demonstrate that the local demagnetization factor decreases as the grain size is reduced. This explains the higher coercivity and the lower temperature dependence of coercivity in magnets with smaller grain sizes. When a fraction of Nd2Fe14B grains become a single domain state for average grain sizes <1 μm, a higher magnetic field is needed to magnetize them, giving rise to a two-step initial magnetization curve.

Original languageEnglish
Pages (from-to)29-32
Number of pages4
JournalScripta Materialia
Volume89
DOIs
Publication statusPublished - 2014 Oct 15
Externally publishedYes

Keywords

  • Coercivity
  • Demagnetization field
  • Micromagnetic simulations
  • Nd-Fe-B sintered magnets

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

Fingerprint Dive into the research topics of 'Micromagnetic simulations on the grain size dependence of coercivity in anisotropic Nd-Fe-B sintered magnets'. Together they form a unique fingerprint.

Cite this