Magnetic properties of B and AB-spinels Zn1−xMxFe2O4 (M = Ni, Mg) materials

The magnetic properties of diluted spinels Zn1−xMxFe2O4 (M = Mg, Ni) systems have been studied by mean field theory, probability law and high-temperature series expansions method in the range 0 ≤ x ≤ 1. The exchange interactions are calculated by the first and second theory, respectively. The magnetic phase diagrams of Zn1−xMxFe2O4 (M = Mg, Ni) are calculated by the high-temperature series expansions, combined with the Padé approximants method. The critical exponent associated with the magnetic susceptibility (γ) is deduced.