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. Etude-du-retournement-optique-dépendant-de-l, hélicité dans des couches minces magnétiques Depuis une quinzaine d'années, de nombreuses solutions différentes ont été proposés afin de modifier l'aimantations de matériaux sans aucun champ magnétique extérieur appliqué. La manipulation d'aimantation à moindre coût énergétique , de préférence à des échelles de temps ultracourtes, est devenu un enjeu fondamental avec des implications pour les technologies d'enregistrement magnétique et de nouvelles sortes de stockage