Abstract
A spin impurity in a Heisenberg ferromagnet can produce a localized spin-wave mode if its spin or its exchange is sufficiently large. By assuming the effect of the perturbation to be very localized, and the local mode frequency to be so high that its thermal excitation is small, we obtain an estimate of the temperature dependence of the local mode frequency. It is found to decrease with temperature, but more slowly than the host magnetization. Furthermore, a mode which is nonexistent at low temperatures can appear at higher temperatures.
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