Abstract
Using the magneto-optical indicator film technique, the correlation between the magnitude of the giant magnetoresistance (GMR) and the micromechanism of the magnetization reversal of electrodeposited Co/Cu superlattices are investigated for a range of Cu spacer thicknesses. The multilayers showing vanishing GMR exhibit a cooperative spin behaviour, which is similar to that exhibited by thin ferromagnetic films with in-plane fourfold anisotropy. In contrast, superlattices with a substantial GMR demonstrate partially coupled noncollinear spin configurations, which are probably responsible for the observed giant magnetoresistance phenomenon.
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