Non-collinear magnetism of Cr nanostructures on : First principles and experimental investigationsS. Lounis1, M. Reif2, P. Mavropoulos1, L. Glaser2, P. H. Dederichs1, M. Martins2, S. Blügel1 and W. Wurth2
1 Institut für Festkörperforschung, Forschungszentrum Jülich - D-52425 Jülich, Germany
2 Universität Hamburg, Institut für Experimentalphysik - Luruper Chaussee 149, D-22761 Hamburg, Germany
received 2 July 2007; accepted in final form 14 December 2007; published February 2008
published online 18 January 2008
A combined experimental, using the X-ray magnetic circular dichroism, and theoretical investigation, using the full-potential Korringa-Kohn-Rostoker (KKR) Green function method, is carried out to study the spin structure of small magnetic Cr adatom clusters on the surface of 3 monolayers of fcc Fe deposited on Cu(001). The exchange interaction between the different Cr adatoms as well as between the Cr atoms and the Fe atoms is of antiferromagnetic nature and of comparable magnitude, leading due to frustration to complex non-collinear magnetic configurations. The presence of non-collinear magnetic coupling obtained by ab initio calculations is confirmed by the experimental results.
75.75.+a - Magnetic properties of nanostructures.
87.64.Ni - Optical absorption, magnetic circular dichroism, and fluorescence spectroscopy.
36.40.Cg - Electronic and magnetic properties of clusters.
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