Nanosize particles of CoFe/sub 2/O/sub 4/ have been synthesized by the citrate precursor technique. Considerably higher coercive force (1.68 kOe) than that obtained by the conventional technique (1.00 kOe) is associated with the nanostructure of CoFe/sub 2/O/sub 4/. These nanosize ferrimagnetic CoFe/sub 2/O/sub 4/ particles exhibit chainlike clusters indicating strong interparticle interactions and reduced magnetic moment, which is attributed to anisotropy and canted spin structure at the surface of the particle. The magnetization shows a peak just below the Curie temperature T/sub c/ during heating in the presence of a small magnetic field (the Hopkinson effect), On the other hand, the magnetization increases monotonically when the system is cooled from T/sub c/. This peak is associated with the single domain behavior of nanocrystalline CoFe/sub 2/O/sub 4/ particles and explained within the mathematical formalism given by Stoner and Wohlfarth in conjunction with other explanations of Hopkinson effect.
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Gajbhiye et al. (1999) studied this question.
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