Analytical Description of the Frequency Dependence of the Magnetocaloric Effect in the Cyclic Magnetic Field of Fe50Rh50

The frequency dependence of ΔTad for the equiatomic Fe50Rh50 alloy has been experimentally investigated in the vicinity of the critical temperature Tc ~ 370 K of the first-order antiferromagnetic–ferromagnetic phase transition. The concept of effective mass describing the influence of sample inhomogeneities, has been proposed. A theory that explains the material’s response to a cyclic magnetic field of a given frequency at temperatures near this transition has also been proposed.