Abstract

Low and room temperature magnetic properties measurements were performed on metal-ferrite composites prepared by coprecipitation of Co and Fe chlorides at various Co/Fe ratios. The microstructure can be described as octahedrally-shaped ferrite particles with nanometric CoFe alloy inclusions. SEM obsevations revealed that ferrite particles were in micron range, with a narrow size distribution. The composite magnetic properties can be interpreted in terms of a nanostructured exchanged-coupled system, while the ferrite-only magnetic behavior is close to a single-domain, Stoner-Wohlfarth, system. Magnetic properties of the ferrite-only and composite of ferrite and soft magnetic-FeCo nanoinclusions has been compared.

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