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We report of a theoretical model for calculating the H-T phase diagrams of arare-earth ferrimagnet, taking into account anisotropies originated by bothmagnetization sublattices' and by the surface. The possibility of an exchangespring formation due to surface anisotropy is considered. This situation isrealized in heterostructures containing a ferrimagnet and a heavy metal. Wederive the stability lose lines of the collinear phase from the free energy ofthe two sublattice ferrimagnet. We numerical calculate the magnetic phasediagrams for the cases when the magnetic field applied along and perpendecularto the easy axis. We demonstrate that tricritical point down at the low fieldrange due to surface anisotropy effect. Moreover, the line of the first orderphase transition between angular and collinear phases reduces due to surfaceanisotropy. In the case when magnetic field is applied perpendicular to theeasy axis we show the possibility of the first order phase transition betweentwo collinear phases in contrast to the phase diagram without surfaceanisotropy.

Phase transitions in rare-earth ferrimagnets with surface anisotropy near the magnetization compensation point