The structural and magnetic properties of Fe$_{2-x}$Mg$_x$CrO$_4$ chromite synthesized by the ceramic method to receive analogs of natural minerals and to solve the rock magnetism problems are investigated. The dependences of cubic-lattice parameters and magnetic characteristics on composition, with slight deviation from linearity, are obtained. It is established in the course of experiments related to the partial thermal remanent magnetization in weak fields that some compositions are characterized by self-reversal under sample heating to 600°C in air. It is suggested that the self-reversal is caused by a nonuniform distribution of cations in chromite structure and phase transformation under oxidation.
75.50.Gg Ferrimagnetics
$^1$Faculty of Physics, Moscow State University, Moscow, 119991, Russiа
$^2$Department of Mathematics and Natural Sciences, Sterlitamak Branch, Bashkir State University, pr. Lenina 47a, Sterlitamak, Russiа
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