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A solid solution of Au-Fe was given various heat treatments causing the Fe to cluster. This variation in short-range compositional order induces corresponding changes in the magnetic behavior of the alloy. Especially noteworthy was the response of the temperature dependence of the magnetic order. There appears to be a gradual change in the nature of the exchange interaction which attains short-range character with increased clustering. The M\"ossbauer effect was used to observe this gradual transition by measuring the magnetic hyperfine splitting of the ^57Fe.
Borg et al. (1972) studied this question.