STRUCTURE AND MAGNETORESISTANCE OF FE CU SUPERLATTICES GROWN ON SI(111)/

The Fe/Cu superlattices were grown on HF-cleaned Si(111) wafers at roo m temperature by electron beam evaporation in ultravacuum. X-ray diffr action and transmission electron microscopy indicate that epitaxial Fe /Cu superlattices are obtained for Cu layers thinner than 24 angstrom. This epitaxial growth is crucially dependent on which element is depo sited first on the Si(111) surface. All superlattices show typically f erromagnetic hysteresis loops and have negative magnetoresistances bet ween 0.2 and 0.3% at room temperature.