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

Abstract

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 16J/kgK was observed at 295K for a magnetic field change of 5T. The values of the refrigeration capacity (RC) at the MST and at TC were found to be 140J/kg and 230J/kg, respectively, at μ0ΔH=5T. The values of the latent heat (L=10.8J/g) and total entropy change (ΔST=31J/kgK) have been determined through DSC measurements. The magnetoresistance associated with the martensitic transformation was found to be 56% for a magnetic field change of 5T at room temperature. The maximum value of the adiabatic temperature change (ΔTad) was found to be 2.2K/T as estimated from experimental data. The relevant parameters affecting the value of magnetocaloric effects are discussed.