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A study has been made of the following rare earth based amorphous alloys: Nd/sub x/Ag/sub 100-x/, Pr/sub x/Ag/sub 100-x/, Gd/sub x/Ag/sub 100-x/, Tl/sub x/Ag/sub 100-x/. In rare earth based amorphous alloys, the symmetrical distribution of the crystal field is very wide and hence not very sensitive to the content of the alloys. The existence of preponderant negative magnetic interactions leads to an upset magnetic order, the magnetization of a small volume not being nil. The magnetic behaviour of alloys with a small concentration of rare earths is governed by the existence of clusters of statistical origin, within which a rare earth ion has at least one other rare earth ion in the position of first neighbour. The presence of a high anisotropy at low temperatures make the magnetic interactions between clusters inoperative. (Atomindex citation 11:519201)