A numerical model for the coercivity of low magnetization materials

In order to characterize magnetic materials properly, it is desirable to have models, based upon first principles if possible, of such material parameters as coercive force. Here, a numerical model of coercivity, for low magnetization materials, is discussed that uses the concept that a domain wall is trapped at inclusions in the magnetic material by the reduction in wall energy. With the choice of one adjustable parameter, reasonable results are obtained for such low magnetization materials as the ferrimagnetic garnets.