Soft magnetic properties of sputtered bcc Fe-Nb-B films with nanoscale grain size

Akihiro Makino, Sayuri Arano, Akihisa Inoue, Tsuyoshi Masumoto

研究成果: Article

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A mostly single bcc phase with nanoscale grain size of about 10 nm was found to be formed by annealing Fe-Nb-B sputtered amorphous films. The bcc Fe-Nb-B alloy films with solute contents of 6.5 to 9.5 at%Nb and 9.5 to 15 at%B annealed at 923 K for 3.6 ks exhibit good soft magnetic properties. Especially, a high permeability (μ) of 4000 at 1 MHz combined with high saturation magnetization (Bs) of 1.55 T was obtained for a Fe81.1Nb7.5B11.4 sputtered film. The good soft magnetic properties seem to result from the decrease in apparent magnetic anisotropy by formation of the nanocrystalline bcc structure and by reduction of magnetostriction due to dissolution of Nb and B into the bcc phase. Amorphous regions surrounding bcc grains were observed in the high-resolution electron micrograph for a Fe79.5Nb7.3B13.2 film annealed for 3.6 ks at 923 K. It is presumed by analysis of the temperature dependence of the grain size and magnetostriction that the thermal stability of the residual amorphous phase increases with the increases of solute elements discharged from the bcc grains.

元の言語English
ページ(範囲)106-112
ページ数7
ジャーナルNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
58
発行部数1
DOI
出版物ステータスPublished - 1994 1 1
外部発表Yes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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