Temperature dependence of static and dynamic properties of an anisotropic ferrimagnet

Abstract

The temperature dependences of the magnetizations of sublattices and the spectra of elementary excitations of an anisotropic ferrimagnet have been investigated. It has been shown that, in the anisotropic ferrimagnet, even a weak single ion anisotropy induces the quantum spin reduction effect and, as a conse quence, changes the behavior of the magnetizations of the sublattices. This gives rise to a new branch of mag netic excitations with the purely longitudinal dynamics of the average value of the spin due to the quantum spin reduction effect.