Martensitic transformation and magnetic properties in Mn49-xCuxNi41Sn10(x =0-2)

The crystal structure, phase transition, metamagnetic behavior and magnetic entropy change (& UDelta;S-M) 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 L2(1) 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 (T-M) of as-annealed samples increases to a high-temperature area, and the Curie temperature (T-C) 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 (& UDelta;S-M) of all alloys were investigated near the martensitic transformation. When the applied magnetic field is 3 T, a worthwhile value of & UDelta;S-M can reach up to 32.0 J & BULL;kg(-1)& BULL;K-1 in Mn47Cu2Ni41Sn10 alloy.

Automated summary

The crystal structure, phase transition, metamagnetic behavior and magnetic entropy change of Mn49-xCuxNi41Sn10(x = 0-2) alloys were studied. The alloys were found to have a highly ordered cubic L2(1) Heusler structure. With the addition of Cu element, the martensitic transformation and inverse martensitic transformation were observed in all samples. The magnetic properties of the alloys, including saturation magnetization and transformation temperatures, were found to be influenced by the Cu content. The alloys exhibited positive values of magnetic entropy change near the martensitic transformation, with the alloy Mn47Cu2Ni41Sn10 showing a significant value of 32.0 J/BULL;kg(-1)& BULL;K-1 when a magnetic field of 3 T was applied.