Magnetic properties of (ZnxFe1 − x)A(Mn1 − xFe1 + x)BO4 materials

The magnetic properties of mixed spinels ( Zn x 2 + Fe 1 - x 3 + ) A ( Mn 1 - x 2 + Fe 1 + x 3 + ) B O 4 2 - ferrite are studied. The effect of Zn doping on magnetic properties of MnFe2O4 ferrite spinel has been studied. The exchange interactions (JAA, JAB and JBB) and exchange constants (λAA, λAB and λBB) of this material are obtained. The general expression of saturation magnetization, the critical temperature and Curie constant (C) are obtained by the mean field theory. The high temperature series expansion combined with the Padé approximant is given to determinate the critical temperature of the mixed spinels. The critical exponent associated with the magnetic susceptibility is given for different values of Padé.