Abstract
Abstract We have studied the influence of Cobalt addition on phase transition temperatures and magnetic properties of melt-spun ribbons of Ni 50− x Co x Mn 31+ y Al 19− y ( x = 0–10, y = 0–3) magnetic shape memory alloys. It was found that addition of Co has a marked influence on the magnetic properties as well as martensitic transformation temperature of the ribbons. Specifically, as compared to a weakly magnetic Co-free ( x , y = 0) sample, the Ni 50− x Co x Mn 31+ y Al 19− y ( x = 5, 10) ribbons demonstrate ferromagnetic properties. The Ni 45 Co 5 Mn 32 Al 18 sample was found to exhibit a well-defined metamagnetic transformation. Thus, our results can be considered as a successful development of metamagnetic shape memory ribbon in the Ni(Co)–Mn–Al system.
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