Magnetic properties and molecular field theory analysis of RFe10Mo2 alloys

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Abstract
The RFe10Mo2 compounds (R=Y, Nd, Gd, Dy) with ThMn12 type structure have been synthesized, and their magnetizations have been investigated in the temperature range from 2 to 800 K using a SQUID magnetometer. The Curie temperature, saturation moments, and measurements, as well as molecular field analysis of the temperature dependence of the magnetization are reported. Our work demonstrates that the molecular field analysis based on a two-sublattice model is capable of quite accurately describing the temperature dependence of the magnetization for the RFe10Mo2 compounds. The results also suggest that the moments of the R and Fe sublattices are nearly collinear in a large temperature range. According to the calculated molecular field coefficients, we find that the magnetic interactions are dominated by exchange between iron 3d electrons, and, on the other hand, the strength of the R–R interaction has even the same order as that of the R–Fe interaction.