Verification of the Phenomenological Model’s Validity for the Conventional and Inverse Magnetocaloric Effects in Ni50Mn34In16

Abstract

The purpose of this research is to evaluate the validity and reliability of a phenomenological model (PM) for the magnetocaloric effect (MCE) in Ni₅₀Mn₃₄In₁₆. By simulating the MCE of Ni₅₀Mn₃₄In₁₆ at temperatures ranging from 190 to 330 K, our work verifies PM for both inverse and conventional MCEs. Interestingly, substantial agreement between measured and simulated magnetic entropy change is obtained across the whole temperature range. Furthermore, there is a satisfactory agreement between the measured and computed absolute values of temperature change (|∆T|) of conventional MCE and portion inverse MCE region temperature greater than critical temperature (T_C). However, due to the latent heat during the martensitic transition in Ni₅₀Mn₃₄In₁₆, the measured |∆T| becomes smaller than the simulated one in the inverse MCE area, which is less than the T_C of the AFM state. These findings suggest that PM is a reliable model for exploring both inverse and conventional MCEs in the same sample, saving time and effort in computing and measuring MCE.