Abstract
The local magnetization in the vicinity of a nonmagnetic impurity in a Heisenberg ferromagnet is calculated for different temperatures below the Curie point. In the low-temperature region the spin-wave approximation is used and calculations are carried out up to first-order perturbation theory. The deviation of the magnetization from the value in a perfect magnet turns out to be proportional to T5/2 for very low temperatures. In the region 0.40 TC<T<TC numerical solutions are obtained for a molecular field model, under the assumption that the influence of the impurity has a finite range. Extrapolations of both sets of results fit reasonably well together for the nearest and next nearest neighbours of the impurity.
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The authors are indebted to Prof. A. J.Dekker for suggesting the subject and to Mr. G.Vertogen for many helpful discussions. Without the valued help of Mr. J. R.Luyten and Mr. H. J.van Linde of the University's Mathematical Center, who skilfully prepared the computer programs, this work could never have been published. The work is part of the scientific program of the Foundation for Fundamental Research on Matter (F.O.M.).
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van de Braak, H.P., Caspers, W.J. The local magnetization of an incomplete ferromagnet. Z. Physik 200, 270–286 (1967). https://doi.org/10.1007/BF01340531
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DOI: https://doi.org/10.1007/BF01340531