Magnetocaloric, thermal, and magnetotransport properties of Ni50Mn35In13.9B1.1 Heusler alloy

The structural, thermal, magnetic, magnetocaloric, and magnetotransport properties of the Heusler alloy Ni50Mn35In13.9B1.1 were studied using room temperature X-ray diffraction, differential scanning calorimetry (DSC), field dependent magnetization, and electrical resistivity measurements. Ni50Mn35In13.9B1.1 exhibits inverse and direct magnetocaloric effects in the vicinity of its magnetostructural transition (MST) and at its Curie temperature (TC), respectively. A maximum magnetic entropy change of 16 J/kg K was observed at 295 K for a magnetic field change of 5 T. The values of the refrigeration capacity (RC) at the MST and at TC were found to be 140 J/kg and 230 J/kg, respectively, at μ0ΔH = 5 T. The values of the latent heat (L = 10.8 J/g) and total entropy change (ΔST = 31 J/kg K) have been determined through DSC measurements. The magnetoresistance associated with the martensitic transformation was found to be 56% for a magnetic field change of 5 T at room temperature. The maximum value of the adiabatic temperature change (ΔTad) was found to be 2.2 K/T as estimated from experimental data. The relevant parameters affecting the value of magnetocaloric effects are discussed.