Effect of Cobalt Addition on Shape Memory Properties of Ferromagnetic Ni-Mn-Ga Sputtered Films

Yoshiharu Katano; Makoto Ohtsuka; Minoru Matsumoto; Kunihiro Koike; Kimio Itagaki

doi:10.2320/matertrans.45.350

Yoshiharu Katano, Makoto Ohtsuka, Minoru Matsumoto, Kunihiro Koike, Kimio Itagaki

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Keywords: nickel-manganese-gallium, ferromagnetic shape memory alloy, Heusler type crystal structure, sputtered film, shape memory effect

JOURNAL FREE ACCESS

2004 Volume 45 Issue 2 Pages 350-352

DOI https://doi.org/10.2320/matertrans.45.350

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Abstract

Effect of adding cobalt on the shape memory properties of Ni-Mn-Ga sputtered films was investigated. It was found that the films containing cobalt less than 5.1 mol% has a single phase and those with more than 6.8 mol%Co has two phases. The Curie temperature increased and the saturation magnetization decreased with increasing cobalt content. These films exhibited one way shape memory effect. The shape recovery start temperature increased and the temperature range of shape change broadened with increasing cobalt content.

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