Magnetic properties of mixed Li–Ni–Cd ferrites

The magnetic properties of mixed Li0.5Ni0.75−x/2Cdx/2Fe2O4 (where x=0, 0.1, 0.3, 0.5, 0.7 and 0.9) ferrites have been reported. The lattice parameter increases linearly with Cd content, which is attributed to ionic size differences of the cations involved. The saturation magnetization increases with increase in cadmium content up to 0.25 and then it decreases with further addition of Cd. The decrease in saturation magnetization (Ms) above Cd=0.25 is explained on the basis of canted spin model. The a.c. susceptibility measurements show presence of MD particles in the samples. The initial permeability is found to increase monotonically with cadmium content. It is observed that μi increases gradually with temperature and then it drops to zero near Curie temperature (Tc). The continuous decrease of Curie temperature (Tc) with Cd2+ content is attributed to the dilution of A–B interaction.