Microstructure optimization to achieve high coercivity in anisotropic Nd-Fe-B thin films

W. B. Cui, Y. K. Takahashi, K. Hono*

*この研究の対応する著者

研究成果: Article査読

80 被引用数 (Scopus)

抄録

A high coercivity of 2.35 MA m-1 (29.5 kOe) is demonstrated using perpendicular anisotropy Nd-Fe-B films. Single layer columnar grown Nd-Fe-B thin films with a coercivity comparable with that of sintered magnets (1.11 MA m-1, 14.0 kOe) were used as the starting film. The coercivity was doubled by annealing films capped with Nd, Nd/Cu, and Nd/Ag layers. Transmission electron microscopy indicated that the Nd 2Fe14B columnar grains were isolated by a Nd-rich grain boundary phase formed by diffusion of the capped layers into the grain boundaries of the polycrystalline Nd-Fe-B films. The temperature dependence of coercivity was lower than that of commercial sintered magnets. The coercivity of the Nd/Cu diffusion processed sample at 473 K was 0.979 MA m-1 (12.3 kOe), which is higher than that of Nd10Dy4Fe 80B6 sintered magnets.

本文言語English
ページ(範囲)7768-7775
ページ数8
ジャーナルActa Materialia
59
20
DOI
出版ステータスPublished - 2011 12
外部発表はい

ASJC Scopus subject areas

  • 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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