Abstract
On the basis of the two sublattice model the temperature dependence of magnetization for RFe2 compounds (R = Tb, Dy, Ho, Er and Tm) is analyzed. The molecular-field coefficients have been derived by fitting the experimental data, and they are transformed into the spin-exchange parameters. The results show that the spin-exchange interactions in RFe2 are stronger than those in R2Fe17, R6Fe23 and RFe3 compounds, which makes their Curie temperatures the highest ones in the corresponding R-Fe binary compounds.
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