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.
Igoshev et al. (Mon,) studied this question.