Abstract
The influence of the magnitude of a random anisotropy on the critical properties of amorphous Dy x Gd 1 − x Ni has been studied by means of low field magnetization experiments. At equilibrium, critical exponents are given, discussed and compared to those previously obtained on other systems. Non equilibrium effects have been investigated showing the existence of irreversibility lines in the planes H-T, T-(D/J) and (D/J)-H Etude par des mesures d'aimantation en champ faible du role d'une anisotropie aleatoire sur les proprietes critiques des amorphes Dy x Gd 1−x Ni. A l'equilibre, les exposants critiques sont donnes, discutes et compares a ceux precedemment obtenus pour d'autres systemes. Des effets hors d'equilibre ont ete examines et montrent l'existence de lignes d'irreversibilite dans les plans H-T, T-(D/J) et (D/J)-H
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