Abstract:
Two-time temperature Green functions are used for calculating the magnetization of
uniaxial ferromagnet with single-ions anisotropy and exchange anisotropy in transversal
magnetic field. In the random phase approximation the expressions for magnetization
and anisotropy field (HA) are obtained for arbitrary temperature, spin and anisotropy
energy parameters. The results obtained are valid for one- and two-sublattice anisotropic
ferromagnets. For magnetic field $H=H_A$ the low-temperature magnetization dependence
is shown to reduce in certain cases to the power law with the degree one.
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