Magnetocaloric, thermal, and magnetotransport properties of Ni₅₀Mn₃₅In_13.9B_1.1 Heusler alloy

Highlights: • Large magnetocaloric effects and magnetoresistance were observed at room temperature. • A wide temperature range of ∆S_M curves were observed, which resulted in a large value of RC. • The relevant parameters affecting the value of magnetocaloric effects are discussed. - Abstract: The structural, thermal, magnetic, magnetocaloric, and magnetotransport properties of the Heusler alloy Ni₅₀Mn₃₅In_13.9B_1.1 were studied using room temperature X-ray diffraction, differential scanning calorimetry (DSC), field dependent magnetization, and electrical resistivity measurements. Ni₅₀Mn₃₅In_13.9B_1.1 exhibits inverse and direct magnetocaloric effects in the vicinity of its magnetostructural transition (MST) and at its Curie temperature (T_C), 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 T_C 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 (ΔS_T = 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 (ΔT_ad) was found to be 2.2 K/T as estimated from experimental data. The relevant parameters affecting the value of magnetocaloric effects are discussed.