Abstract
We apply the local approximation of the density-functional theory and Korringa-Kohn-Rostoker Green's-function method to investigate magnetic properties of Fe$X$ $(X=3d)$ clusters on Ag(001). Mixed dimers, impurities in small Fe clusters, plain islands, and cluster sandwiches are considered. In many cases we find both ferromagnetic and antiferromagnetic solutions with large magnetic moments. In particular, we discuss FeCr and FeMn supported clusters. Total-energy calculations show that the energy difference between magnetic configurations in these systems is small; therefore, magnetic fluctuations are possible in FeCr and FeMn nanostructures.
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