Spontaneous magnetization curves and curie points of spinels containing two types of magnetic ion

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Abstract
Weiss molecular field theory has been applied to spinels containing two types of ions carrying magnetic moment. By neglecting AA and BB interactions and considering only the four AB interactions between the two types of ion in the two types of site, it is shown that anomalous spontaneous magnetization curves can arise, some of which are more varied than those described by Néel. Calculated curves for titanomagnetites with Fe2+ and Fe2+ ions as carriers of magnetic moment are similar to the Néel P type for some cation distributions, in agreement with experimental data. Spinel systems containing Fe3+ Co2+ and Fe3+ Ni2+ have also been considered and a general expression for the Curie point of spinels containing two types of ions carrying magnetic moment is given as a function of the cation concentration on the A and B sites and the lattice parameter.

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