Magnetic Properties of Sm-Co and Sm-Co/M (M=Co, Fe) Exchange-Spring Films

Yoshihiro Yamazaki; Kazuhide Takano; Hitoshi Takamura; Satoshi Sugimoto; Motofumi Homma; Masuo Okada

doi:10.2497/jjspm.44.827

Yoshihiro Yamazaki, Kazuhide Takano, Hitoshi Takamura, Satoshi Sugimoto, Motofumi Homma, Masuo Okada

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Keywords: exchange-spring magnet, exchange coupling, reversible magnetization, film magnet, Sm-Co system

JOURNAL OPEN ACCESS

1997 Volume 44 Issue 9 Pages 827-832

DOI https://doi.org/10.2497/jjspm.44.827

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Abstract

The structure and magnetic properties of Sm-Co films and Sm-Co/M (M=Co, Fe) multilayered films prepared by rf sputtering were investigated. The results show that a hard magnetic phase as Sm₂Co₁₇ and SmCo₅ phase and a soft magnetic phase were formed by annealing Sm-Co and Sm-Co/M films. Sm₁₆Co₈₄ film annealed for 1.8 ks at 773 K had the springback ratio of [Mr-M(H)]/[Mr-M(H)]=0.72. This film was found to behave as a exchange-spring magnet composed of a hard magnetic phase and a soft magnetic phase. Sm₁₆Co₈₄/Fe multilayered film was also found to be a exchange-spring magnet.

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