Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 99: Scanning Probe Methods III
O 99.10: Vortrag
Freitag, 4. April 2014, 12:45–13:00, GER 38
Investigations of the surface structure of Pt and Fe/Pt by PAES, XPS and STM — •Samantha Zimnik1,2, Christian Piochacz1,2, Sebastian Vohburger2, and Christoph Hugenschmidt1,2 — 1Technische Universität München, Physik Department,Lehrstuhl E21, James-Franck-Straße, D-85748 Garching, Germany — 2Technische Universität München, Forschungs-Neutronenquelle Heinz Maier-Leibnitz, Lichtenbergstraße 1, D-85748 Garching, Germany
The characterization of the elemental composition of surfaces is of high importance for the understanding of many surface processes such as surface segregation or oxidation. These processes may significantly affect the macroscopic properties of thin films or nano particles such as the magnetization in the system Fe/Pt. Positron annihilation induced Auger Electron Spectroscopy (PAES) is a powerful technique to gather information about the elemental composition of only the topmost atomic layer of a sample. The positron beam facility NEPOMUC at the research reactor Heinz Maier-Leibnitz delivers a high-intensity positron beam with an intensity of 109 e+/s. Thus, time-dependent PAES becomes possible and enables an in-situ observation of the surface segregation process.
The upgraded surface spectrometer at NEPOMUC uses the complementary techniques PAES, XPS and STM for a comprehensive surface analysis and enables the characterization of the elemental composition and the surface topology. Recent studies on the surface of Pt and Fe/Pt with PAES, XPS and STM will be presented.