Measurements of the temperature dependence of the hyperfine magnetic field Hᵢ at Fe nuclei and the concentration dependence of the transition temperature Tc in platinum-iron alloys have been carried out by using the M\"ossbauer-effect technique. These experiments have been done in a series of dilute alloys ranging between 1 and 15 at.% of iron concentration. We find that at low temperatures (TTc), Hᵢ is nearly the same at each Fe nucleus. As the temperature is increased, a broadening of the absorption lines of the M\"ossbauer spectra is observed. Such broadening may be due to the presence of a rather wide distribution of fields Hᵢ, although relaxation effects cannot be completely ruled out. The concentration dependence of the transition temperature Tc can be related to a short-range interaction (not necessarily first nearest neighbors) between magnetic atoms (for Fe concentrations between about 2 and 8 at.%), and to a longer-range weaker interaction (below 1 at.% Fe) between magnetic impurities via the enhanced conduction-electron polarization of the platinum matrix.
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R. Segnan (1967) studied this question.