Inversion degree and saturation magnetization of different nanocrystalline cobalt ferrites

CONCAS, GIORGIO;G. SPANO;CANNAS, CARLA;MUSINU, ANNA MARIA GIOVANNA;PEDDIS, DAVIDE;G. PICCALUGA

2009-01-01

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Abstract

The inversion degree of a series of nanocrystalline samples of CoFe(2)O(4) ferrites has been evaluated by a combined study, which exploits the saturation magnetization at 4.2 K and (57)Fe Mossbauer spectroscopy. The samples, prepared by sol-gel autocombustion, have different thermal history and particle size. The differences observed in the saturation magnetization of these samples are explained in terms of different inversion degrees, as confirmed by the analysis of the components in the Mossbauer spectra. It is notable that the inversion degrees of the samples investigated are set among the highest values reported in the literature.