Regensburg 2000 – wissenschaftliches Programm

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AM: Magnetismus

AM 17: Oberflächenmagnetismus: elektronische Eigenschaften, reine Oberflächen

AM 17.1: Vortrag

Mittwoch, 29. März 2000, 16:45–17:00, H22

Spin-Resolved Appearance Potential Spectroscopy investigation of magnetic surface layer systems — •V. Popescu¹, H. Ebert¹, L. Szunyogh^2,3, P. Weinberger^4,2, and M. Donath⁵ — ¹Inst. für Physik. Chemie, Universität München, Butenandtstr. 5-13, 81377 München, Germany — ²Center of Computational Materials Science, TU Vienna, Austria — ³Department of Theoretical Physics, TU Budapest, Hungary — ⁴Institut für Technische Elektrochemie, TU Vienna, Austria — ⁵Physik Institut, Universität Münster, Wilhelm Klemm Str. 10, D 48149 Münster, Germany

The theoretical description of Spin-Resolved Appearance Potential Spectroscopy (SR-APS) for bulk systems has been extended to deal with magnetic surface layer systems. Applications for Fe-layers on top of a (001)-oriented Cu surface are presented and compared with available experimental data. For a most detailed discussion of the results the layer-resolved contributions to the total APS signal are used. This is especially helpful in the case of Fe on top of a Cu-substrate for which non-ferromagnetic spin-structures are very important. Theoretical SR-APS enabled us to give a sound interpretation of the previous experimental results. In particular, it was found that SR-APS spectra of certain anti-ferromagnetic configurations, theoretically predicted to be the ground-state configurations, show a nearly perfect agreement with the corresponding experimental data.