Temperature dependence of the field-induced phase transformation in Ni50Mn37Sn13

Polycrystalline Ni50Mn37Sn13 alloy was fully homogenized such that the structural and magnetic transitions were clearly separated from each other in temperature. The sequence of transitions on cooling is: (1) austenite Curie point; (2) austenite to martensite structural and coupled ferromagnetic to paramagnetic transitions (first-order); and (3) martensite Curie point. Most notably, we found the field-induced transformation occurs from paramagnetic martensite to ferromagnetic austenite. The field-induced transition has a temperature dependence of −10 kOe K−1 over a narrow temperature range.