. Finalement, Gd 10 Fe 90 sur l'effet de magnétorésistance géante Pour cela, la magnétorésistance d'une multicouche spin-valve Gd 40 Fe 60 / Gd 10 Fe 90 /Cu/ Gd 40 Fe 60 a été testée Une magnétorésistance géante négative d'amplitude 0.1 % est mesurée à basse température (ce qui est assez faible, typiquement de l'ordre des variations d'AMR observées sur ce même système). L'apparition de cette magnétorésistance géante négative s'explique en considérant que les diffusions majoritaires dépendantes du spin dans la couche de Gd x Fe 1-x (en volume ou à l'interface) sont des diffusions de type s -d impliquant uniquement les orbitales électroniques du sous-réseau de fer, Die94][Bel96]. Nos expériences sur la multicouche amorphe Gd 40 Fe 60 /Gd 10 Fe 90 /Cu/Gd 40 Fe 60 prouvent que, dans une telle structure, les variations de magnétorésistance géante ne dépendent que des diffusions aux interfaces GdFe

. Un-faisceau-de, Les neutrons sont alors dirigés vers l'échantillon. En outre, on cherche à obtenir un faisceau incident monochromatique. Ceci est réalisable par réflexion de Bragg sur un cristal de plans réflecteurs (hkl) monochromateur. Ce monochromateur sélectionne une longueur d'onde unique, 4,75 Å dans le cas de NG1. Le faisceau monochromatique ainsi obtenu est non polarisé. On le fait donc passer dans un polariseur (super-miroir Fe/Si) qui sélectionne les neutrons incidents « up » (ou « down ») Après reflexion sur l'échantillon, un second super-miroir permet

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