RbsumB.-Les courbes d'aimantation de forme complexe sont obtenues en appliquant des contraintes des ferromagnktiques soumis a de faibles champs de pulsation. Un ensemble consbquent de donnkes est dkcrit en termes de parametres-empiriques et de courbes caractkristiques rendant compte des rotations des mouvements irrkversibles de parois et de transformations compl~tes des domaines. L'observation des domaines et des cycles de contraintes permettent les interprktations.
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