Abstract
The magnetic properties of Sm-Co-Cu films and Sm-Co-Cu/Co multilayered films prepared by rf-sputtering were investigated. The addition of Cu to Sm-Co film had the effect of decrement of crystallization temperature. The Sm 28 Co 59 Cu 13 film annealed for 1 h at 623 K showed a reversible demagnetization curve with 82% springback ratio of [Mr'-M(H)]/[Mr-M(H)] and a high coercivity of 2480 kA . m -1 . This film was found to be an exchange-spring magnet film composed of the hard magnetic phase such as SmCo 5 and Sm 2 Co 7 phases and a soft magnetic phase of Co. Sm 28 Co 59 Cu 13 /Co(x nm) multilayered film whose Co thickness was from 0 to 15 nm was also found to be an exchange-spring magnet film.
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