Abstract
Dependence of magnetic behavior of ultrathin Fe layers on the width of the interfaces was investigated by using dc-magnetron sputtering to grow (Fe(110)/Ag(111)) multilayers (ML) with thin interfaces and (Fe(111)/Cu(111)) multilayer with wide interfaces. Thicknesses of non-magnetic layers in all cases were 25 A. The Fe/Ag MLs were prepared with thickness of Fe layers t Fe = 8.8 A and 2.4 A, while Cu/Fe ML had the largest t Fe = 11.0 A together with widest interfaces. In-field 57Fe conversion electron Mossbauer spectroscopy (CEMS) down to 50 K was employed to show that Fe layers are not uniform, to characterize interfaces, and to distinguish between static and relaxation behavior. This allowed unambiguous interpretation of T-dependencies of susceptibility and spontaneous magnetisation upon crossover to island structure of the Fe layers.
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