Abstract
The c(2 × 2)MnCusurface alloy on Cu(100) can be considered as a purely two-dimensional magneticsystem where the Mn atoms exhibit a large corrugation closely related to their highspin moment. In this paper we investigate the influence of the atomic environmenton the electronic and magnetic properties of the two-dimensional alloyed layer,extending our study to the less known multilayered system made of MnCutwo-dimensional alloy layers embedded in a Cu crystal. The analysis is based onangle-resolved photoelectron spectroscopy measurements and calculations usingthe Green function matching method, which allows us to treat exactly theprojection of the three-dimensional lattice on the c(2 × 2)plane. A complete study of the valence band is performed along the two-dimensionalBrillouin zone in a wide energy range. We show that the presence of Mn results inan important redistribution of the spin-polarized electronic states of theneighbouring Cu atoms. This redistribution is not accompanied by a netcharge transfer between different atoms, and also the spin moment of Curemains small. Most of the new features induced by Mn in the surfacealloy are also present in the multilayered system, evidencing that theyare specific to the two-dimensional alloyed layer and not surface effects.
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