Magnetism of ultrathin intergranular boundary regions in Nd-Fe-B permanent magnets

Y. Murakami, T. Tanigaki, T. T. Sasaki, Y. Takeno, H. S. Park, T. Matsuda, T. Ohkubo, K. Hono, D. Shindo

研究成果: Contribution to journalArticle査読

73 被引用数 (Scopus)

抄録

The magnetism of a thin grain-boundary (GB) phase that envelopes the Nd2Fe14B grains in optimally annealed Nd-Fe-B sintered magnets was investigated by electron holography. The phase shift measured from a thin-foil specimen containing a tilted amorphous GB phase (∼3 nm in width) was -0.34 rad, which is substantially smaller than that expected for the nonferromagnetic GB phase of -1.2 rad. Simulations of the phase shift with various magnetization values suggest that the magnetic flux density of the GB phase is ∼1.0 T. The observations imply significant exchange coupling between Nd2Fe14B grains, which can explain the avalanche propagation of magnetization reversal observed in sintered magnets.

本文言語英語
ページ(範囲)370-379
ページ数10
ジャーナルActa Materialia
71
DOI
出版ステータス出版済み - 6 2014
外部発表はい

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • ポリマーおよびプラスチック
  • 金属および合金

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