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The contribution to the interaction free energy of a pair of substitutional impurities in a ferromagnet due to the distortion of the spin-wave spectrum is evaluated by second-order perturbation theory. It is shown that the leading term in this interaction at low temperatures is attractive and leads to a short range force whose form can be evaluated analytically for large distance of separation between the impurities. This interaction vanishes at absolute zero of temperature.
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Vashishta et al. (1965) studied this question.
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