Abstract
The static and dynamic properties of an anisotropic ferrimagnet, which has sublattices with S = 1 and σ = 1/2 and is characterized by a non-Heisenberg (spin bilinear or biquadratic) exchange interaction for the sublattice with S = 1, are studied. The anisotropy is determined by the Ising interaction of the sublattices. When the non-Heisenberg exchange interaction of the sublattice with S = 1 is taken into account, the anisotropic system is shown to be in a phase with vector order parameters (ferrimagnetic phase) and in a phase characterized by both vector and tensor order parameters (quadrupole-ferrimagnetic phase). The type of the phase transition between these phases and the condition of compensating the magnetic moments of the sublattices are determined.
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