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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In the absence of metallic inclusions, for single spinel phase, the magnetization reversal might also be due to domain nucleation. However, the high values of the coercivity point out that the nucleation process requires an energy very close to the corresponding to coherent rotation of the magnetization. The values of coercivity becomes a little lower than the anisotropy field, probably due to the efifect of intense local demagnetizing field of defects created by elimination of metal inclusions. In summary, we should say that according to the remanence value as well as to the coercivity strength the magnetization reversal of the spinel particles seems to occur by coherent magnetization rotation which gives rise to either pure rotation or reversal domain nucleation.
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Multigner, M., Läkamp, S., Pourroy, G., Hernando, A., Valenzuela, R. (1997). Influence of Fe-Co Nanoinclusions on the Magnetic Behavior of Fe-Co Ferrites. In: Hadjipanayis, G.C. (eds) Magnetic Hysteresis in Novel Magnetic Materials. NATO ASI Series, vol 338. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5478-9_42
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DOI: https://doi.org/10.1007/978-94-011-5478-9_42
Publisher Name: Springer, Dordrecht
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