For the nanocomposite magnets the best magnetic properties were obtained with the average grain size of α-Fe and with the content of α-Fe that is well below the structural percolation threshold of the soft magnetic phase. The measured dependence of the coercivity on the grain size of α-Fe tends to indicate that the optimum grain size increases with increasing α-Fe content, for If contracted hysteresis is formed; if the coercivity rapidly decrease due to possible coupling between hard magnetic grains situated at two sides of a soft grain.
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