Abstract
The magnetic properties of spinel ferrites [Fe1−(1−x)y3+Cu(1−x)y2+]A[Nix2+Cu(1−x)(1−y)2+Fe1+(1−x)y3+]BO4 have been studied by the mean field theory (MFT) and high temperature series expansions (HTSEs) combined with the Padé approximants. The critical temperature, the saturation magnetisation (MS) and the intra-sublattice exchanges interactions (JAA(x,y), JBB(x,y) and JAB(x,y)) are obtained by using a probability distribution law. The critical exponents associate with the magnetic susceptibility have been obtained. The effect of copper doping on the magnetic properties of nickel ferrites has been examined.
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