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The nucleation fields of isotropic nanocrystalline single-phase Sm-Fe-N magnets prepared by mechanical alloying have been determined experimentally. Single-phase Sm-Fe-N magnets possess a distinct angular dependence of the nucleation field, giving rise to a nucleation-controlled magnetic reversal process. The influence of the substitution of Co and Ti for Fe is discussed. Additionally, two-phase (Sm 2 Fe 17 N x + alpha -Fe) alloys have been investigated by measuring the perpendicular and the parallel components of the magnetization and their remanence. Remanence enhancement has been observed; that is, the magnetic reversal in these two-phase alloys is strongly affected by intergrain exchange interaction. This may give rise to cascades of magnetization reversal due to collective processes. A phenomenological explanation of the magnetic reversal in these systems is suggested.
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Hermann et al. (1995) studied this question.
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