Abstract
The field dependence (up to 35 T) at 4.2 K of the magnetization of several compounds of the type R1−xYxFe2 was studied. The magnetic isotherms at 4.2 K were analyzed with a mean-field model. The magnetic coupling constant JFRe between the moments of the rare earth (R) and Fe in the Hamiltonian H = ΣRFe2JRFeSRSFe were compared with the coupling constants derived from a mean-field analysis of the Curie temperatures.From a comparison of the magnetic coupling constants found by means of high-field measurements in the compounds RFe2, RFe3, R6Fe23 and R2Fe17 it follows that the R-Fe coupling constants have a pronounced tendency to decrease with Fe concentration.
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