Theory of dynamic and thermodynamic properties of an impurity spin in an anisotropic Heisenberg ferromagnet

The behavior of an impurity spin with arbitrary parameters in an anisotropic Heisenberg ferromagnet has been analyzed by the Jacobi matrix technique. The theory developed permits a number of observed effects to be described from a unified point of view. In particular, the single-ion anisotropy is shown to affect strongly the temperature dependence of the spontaneous magnetization of an impurity atom. The appearance of a quasilocal impurity state near the bottom of the continuous spectrum is possible for nonweak-coupled impurity spins, providing an explanation for the observed broad quasilocal levels.

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