SPIN CONFIGURATIONS IN THE ABSENCE OF A MAGNETIC-FIELD IN A 2-SUBLATTICE SYSTEM

The spin configurations in the absence of an external magnetic field h ave been systematically investigated for a two-sublattice system. Base d on a two-sublattice model, the conditions for the existence of colli near and non-collinear spin structures were derived for either ferroma gnetic or ferrimagnetic materials and the phase diagrams of the spin c onfigurations at zero field were drawn, taking into account the second -order anisotropy parameters of both sublattices. The inclusion of hig her-order anisotropy is discussed and it is shown that in some cases t he same phase diagrams result.