Abstract
Amorphous magnetic rare-earth alloys have been the subject of considerable interest in the recent past (1). Particular emphasis has been placed in the literature on amorphous systems made of rare earths with a large amount of transition metals. While great progress has been made toward understanding of the respective roles of local magnetic anisotropy and exchange inter-actions in heavy-rare-earth based amorphous compounds (2), amorphous alloys with light lanthanides have received far less attention (3–4). We have undertaken a systematic study of the magnetic properties of the amorphous RE4Au alloys. Such amorphous alloys obtained by splat-cooling seemed to be attractive for magnetic studies for the two following reasons. First, the gold constituent is not likely to have a substantial magnetic moment. Second, owing to the large RE content (80 at. %), we lie in a situation relatively close to that of pure amorphous rare earths.
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