Experimental and theoretical studies of kinetics of phase transitions in magnetocaloric materials

The problem of rate of phase transitions requires an indispensable solution, because the creation of new technologies based on “giant” effects in vicinity of phase transitions in magnetic materials is impossibly without solving of this problem. For example, the magnetocaloric effect (MCE) reaches its peaks near the phase transitions in magnetics, therefore knowledge of phase transitions rate is necessary for creation of new technology of magnetic refrigeration at room temperature. The rate of phase transition limits the frequency of thermodynamic cycles. Accordingly, the power of refrigeration will depend on the frequency of cycles, and it is difficult to judge the profitability and competitiveness of the creation of this machine without determining the parameters of power. In this paper, we present a new technique for experimental study of the kinetics of the magnetic phase transitions under low alternating magnetic field, and the theoretical calculations of respective kinetic processes.