文摘
We have synthesized a nominal composition of Ni50Mn30Sn20 alloy using arc melting technique. Rietveld refinement confirms the austenite L21 structure in the Fm-3m space group. Electrical resistivity has been found to be clearly exhibiting two different phenomena viz a magnetic transition from paramagnetic to ferromagnetic and a structural transition from austenite to martensite phase. Thermo-magnetization measurements M(T) confirms ferromagnetic transition temperature TC at 222 K and martensitic transition starting at 127 K (MS). Magnetization measurement M(H) at 10 K confirms the ferromagnetic state. Frequency dependence of AC susceptibility χ’ at low temperature suggests spin glass behavior in the system. The isothermal magnetic entropy change values have been found to be 1.14, 2.69, and 3.9 J/Kg.K, with refrigeration capacities of 19.6, 37.8, and 54.6 J/Kg for the field change of 1, 2, and 3 T respectively at 227 K.