Abstract
A theoretical model of metamagnetic-like (ferromagnetic–paramagnetic and ferromagnetic–antiferromagnetic) phase transitions is developed for the interpretation of experimental results obtained recently for the Ni–Mn–Co–X (X = In, Sn, Ga) shape memory alloys. The conditions of elastically driven (caused by the martensitic transformation of alloy) metamagnetic-like phase transitions are determined. These conditions are: high magnetic susceptibility of paramagnetic/antiferromagnetic phase; large (but real for some alloys) volume change during the martensitic transformation; and large value of volume magnetostriction caused by the metamagnetic-like phase transition. The magnetoelastic mechanism is proposed for the explanation of magnetic field influence on the martensitic transformation. The elastically driven ferromagnetic–paramagnetic phase transition is considered in more detail and the results of corresponding magnetic measurements are described.
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