Abstract
Anisotropic ferrimagnets—unlike isotropic ones—exhibit a rich variety of shapes of magnetization curves. The possibilities are analyzed in an exhaustive fashion within a model with second-order anisotropy on both sublattices, limited to low temperatures and high-symmetry orientations of the applied magnetic field. It is important to discriminate between ferrimagnets with grossly unequal sublattices (when the moments differ by a factor of 2 or more) and those whose sublattice moments are relatively close, i.e., differ by less than a factor of 2. In the former case, as many as 10 different curve shapes are possible; in the latter case, only 9. For a given compound and field direction, the shape is determined by the system’s locus in the coordinate plane of reduced anisotropy parameters. For any ratio of the sublattice moments, such a diagram is obtainable by means of analytic expressions.
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