Dependence of the inverse magnetocaloric effect on the field-change rate in Mn3GaC and its relationship to the kinetics of the phase transition

Abstract

We study the dependence of the magnetocaloric effect on the magnetic field-change-rate the first order magnetostructural transition in Mn3GaC by measuring the adiabatic temperature change ΔT at three different time scales: 11 mT s−1, 700 mT s−1, and ∼1000 T s−1. We find that the maximum adiabatic temperature-change of about 5 K is reached in the 11 mT s−1 and 700 mT s−1 rates, whereas for the ∼1000 T s−1-rate the transition lags the change in the magnetic field so that the maximum adiabatic temperature-change is not attained.