Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 28: Surface or interface magnetism
O 28.10: Vortrag
Dienstag, 23. März 2010, 12:45–13:00, H48
Hard x-ray standing-wave excited photoemission experiments on the MgO/Fe interface — •Sven Döring1, Frank Schönbohm1, Ulf Berges1, Charles S. Fadley2,3, Daniel E. Bürgler4, Mihaela Gorgoi5, Walter Braun5, Claus M. Schneider4, and Carsten Westphal1 — 1DELTA/Experimentelle Physik I, TU Dortmund, Otto-Hahn-Str. 4, 44221 Dortmund, Germany — 2Materials and Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA — 3University of California, Davis, CA 95616, USA — 4Institut für Festkörperforschung, IFF-9, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany — 5Helmholtz-Zentrum Berlin - BESSY, Albert-Einstein-Str. 15, 12489 Berlin, Germany
For layer systems, photoemission experiments with high and reliable depth resolution are essential in order to distinguish between interface effects and bulk photoemission signals. Here we extend the soft x-ray standing-wave photoemission method into the hard x-ray regime to achieve the required high depth resolution and high probing depth. An Fe wedge was grown on top of a MoSi2/Si multilayer with a period of about 40 Å and subsequently covered by a thin MgO film. By moving the wedge structure with respect to the x-ray beam we were able to observe several cycles of the x-ray standing wave field moving through the sample layers. The analysis of the photoemission intensity modulations results in a well-resolved depth-profile of the sample. At the interface the intermixing of Fe and MgO can be studied due to the enhanced interface sensitivity provided by the x-ray standing field.