Magnetic properties of nanocomposite and materials with an excess of Fe

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Abstract
Two-phase nanocomposite materials have been prepared by high-energy ball-milling (HEBM) (2:14:1 phase) (u = 0, 0.75, 1.5 or 3.0; y = 0 or 11.6 and z = 0 or 0.5) or (1:12 phase), with excess Fe and then annealing. Magnetic properties of materials containing volume fractions of up to 75% of a magnetically soft Fe phase have been investigated and remanence enhancement observed. Optimum magnetic properties are obtained for materials with a volume fraction of a magnetically soft phase of 37 - 40%; for -Fe powders a remanent magnetic polarization of 1.05 T and intrinsic coercivity of ; and for -Fe powders a remanent magnetic polarization of 0.85 T and intrinsic coercivity of . For Co-containing alloys, evidence was observed for the redistribution of Co in the HEBM process, resulting in a magnetically soft Fe(Co) phase. The magnetic properties of isotropic -Fe and -Fe type magnets, compacted by hot pressing, are reported.

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