Abstract
Magnetic properties of amorphous FexPd80−xSi20 alloys (x=0.5–7) obtained by rapid quenching from the liquid state are studied between 1.5° and 300°K and in fields up to 8.40 kOe. The amorphous alloys are paramagnetic above the characteristic temperature Td. The observed magnetic moments can be explained by postulating a simple magnetic domain consisting of one Fe atom and its Pd nearest neighbors. This is consistent with the magnetic moments assigned to each Fe atom (μFe=3.0μB) and to each Pd atom (μPd=0.20μB). Below Td superparamagnetic clusters exist in the amorphous alloys. Ferromagnetism is found in amorphous Fe7Pd73Si20 alloys with a Curie temperature of 28°K. Evidence is discussed which demonstrates that the d-d spin exchange interaction is weaker in the amorphous alloys than in the corresponding crystalline alloys.
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