Angular dependence and thermal stability of coercivity of Nd-rich Ga-doped Nd–Fe–B sintered magnet

J. Li, Xin Tang, H. Sepehri-Amin, T. T. Sasaki, T. Ohkubo, K. Hono

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We studied the angular dependence and thermal stability of coercivity of Nd-rich Ga-doped Nd–Fe–B sintered magnets. Experimentally measured angular dependence of coercivity for the as-sintered magnet agrees well with the micromagnetic simulation results for exchange-coupled polycrystalline model that assumes the magnetization reversal is dominated by the domain wall depinning at the grain boundaries. On the other hand, the measured angular dependence of coercivity of the post-sinter annealed sample with an enhanced coercivity deviates from fully exchange-decoupled model in spite of previous experimental results on inter-grain exchange decoupling. Based on micromagnetic simulations and Kronmüller equation, it is suggested that the entire elimination of magnetic exchange coupling between Nd2Fe14B grains can further improve the coercivity and its thermal stability of the 5 µm-grain-sized Dy-free magnet.

Original languageEnglish
Pages (from-to)66-72
Number of pages7
JournalActa Materialia
Volume187
DOIs
Publication statusPublished - 2020 Apr 1
Externally publishedYes

Keywords

  • Angular dependence of coercivity
  • Ga-doped sintered magnet
  • Micromagnetic simulation
  • Thermal stability of coercivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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