Abstract
The spin configurations in the absence of an external magnetic field have been systematically investigated for a two-sublattice system. Based on a two-sublattice model, the conditions for the existence of collinear and non-collinear spin structures were derived for either ferromagnetic or ferrimagnetic materials and the phase diagrams of the spin configurations at zero field were drawn, taking into account the second-order anisotropy parameters of both sublattices. The inclusion of higher-order anisotropy is discussed and it is shown that in some cases the same phase diagrams result.
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