Abstract
The magnetic properties of cobalt ferrite (CoFe2O4) have been studied with the mean field approximation using the Bogoliubov inequality. An influence of temperature on the magnetization of cobalt ferrite was investigated in the absence and presence of crystal fields. The effect of exchange interactions revealed different behaviors of the magnetization versus the temperature; a pure ferrimagnetic state and a frustrated magnetic behavior were observed for the cobalt ferrite. In addition, the study of the exchange interactions effect on the total magnetization shows that for strong coupling interactions, the total magnetization of the system exhibits a jump at a given temperature. A first order phase transition from ferrimagnetic to ferromagnetic phase, a second order transition from ferromagnetic to paramagnetic phase and from ferrimagnetic to paramagnetic phase were observed.
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