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Abstract
Results of 57Fe Mossbauer, AC and DC susceptibility, grazing incidence X-ray diffraction, resistivity and Rutherford-backscattering measurements on the amorphous alloys \({\text{Fe}}_{100 - x} {\text{Sc}}_x (8 \leqslant x \leqslant 70)\) give for the first time convincing evidence for the antiferromagnetic exchange coupling between Fe-moments. The antiferromagnetic coupling between Fe-moments is for \((8 \leqslant x \leqslant 70)\) limited to certain regions (magnetic clusters) of the sample. The nature of the coupling is of the Heisenberg type. For \(8 \leqslant x < 20\), the magnetic coupling between Fe-moments is across nonmagnetic Sc-atoms. The conduction electrons mediate an indirect magnetic interaction between the Fe-moments. The magnetic exchange coupling between Fe-moments across Sc-atoms is negative. The antiferromagnetic coupling between Fe-moments can be explained by the Ruderman-Kittel-Kasuya-Yosida, RKKY, interaction by taking into account the damped oscillatory behavior of the RKKY interactions.
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