LAUSR

The crystal structure, phase transition, metamagnetic behavior and magnetic entropy change (ΔSM) of the Mn49−xCuxNi41Sn10(x = 0–2) alloys were systematically studied. The results of experiment about crystal structure confirm that Mn49−xCuxNi41Sn10 alloys have a highly ordered cubic L21 Heusler structure. With Cu element improving, all samples have a martensitic transformation and inverse martensitic transformation by analyzing the result of magnetic measurement. The saturation magnetization of samples decreases gradually, the martensitic transformation temperature (TM) of as-annealed samples increases to a high-temperature area, and the Curie temperature (TC) of samples moves to a low-temperature area with the content of Cu element increasing from x = 0 to x = 2. The positive values of magnetic entropy change (ΔSM) of all alloys were investigated near the martensitic transformation. When the applied magnetic field is 3 T, a worthwhile value of ΔSM can reach up to 32.0 J·kg−1·K−1 in Mn47Cu2Ni41Sn10 alloy.