New two-dimensional model for inhomogeneous permanent magnets

Existing solutions of the nucleation fields in inhomogeneous ferromagnets, based on the minimization of the energy equation of a soft magnetic inclusi on implanted in a hard magnetic matrix, are reviewed and compared. A macros copic two-dimensional (2-D) model based on the Preisach formalism is propos ed. The properties of the model and the effect of the identification parame ters on the major loop characteristics are investigated. The simulated resu lts include major and minor loops and the rotational hysteresis loss calcul ation.