CO65FE35 AG ALLOY AND MULTILAYER GROWTH CHECKED BY IN-SITU RESISTANCE/

We present an in situ resistance study of evaporated Co65Fe35/Ag alloy s, which present a giant magnetoresistance (GMR) effect. We have obser ved the influence of the substrate and evaluated the initial perturbed layer in coevaporated alloys, in multilayers with thick layers, and i n multilayers with very thin layers. When very thin 'layers' of each m etal are deposited, a granular structure is observed. This particular preparation mode allows us to observe, at the beginning of the deposit ion, a preferential sticking of the Co65Fe35 alloy on the substrate ra ther than on the already deposited Ag. This result shows the dependenc e of the granular structure on the sample thickness and corroborates G MR results.