Computer simulation of the field dependence of the magnetization of a two sublattice ferrimagnet with hexagonal anisotropy

A two sublattice model for a ferrimagnetic system including the anisotropy up to the second order constant is developed. The magnetization behaviour as a function of the applied field with varying field directions is studied. The occurance of hysteresis effects in antiferromagnets is described using all possible solutions of the minima condition of the energy equation. The second order anisotropy is reduced to first order by a fit procedure of the anisotropy function. The model is used to describe the magnetization behaviour of cases where in both sublattices an easy c-axis is assumed. Additionally the magnetization process in a material with an easy c-axis and an easy basal plane is discussed.