Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Poster Session III (Solid-liquid interfaces; Scanning probe and other methods; Electronic structure theory; Spin-orbit interaction)

O 58.64: Poster

Mittwoch, 13. März 2013, 18:15–21:45, Poster B1

Surface segregation of FePt investigated by STM, XPS and PAES — •Samantha Zimnik¹, Christoph Hugenschmidt^1,2, and Florian Lippert¹ — ¹TU München, Lehrstuhl E21, James-Franck Straße, 85748 Garching — ²ZWE FRM-II, Lichtenbergstr. 1, 85747 Garching

Segregation processes are of high importance for the understanding of the macroscopic properties of thin films or nano particles such as the magnetization in the system FePt. 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. Time dependent PAES allows the observation of the segregation process in-situ. The results are compared with X-ray induced Photoelectron Spectra (XPS). The Scanning Tunneling Microscope (STM) is used as a complementary method to investigate the electron density with atomic resolution of the same sample before and after the segregation process. PAES, XPS and STM allow the characterization of both, the elemental composition and the surface topology. The new experimental setup at NEPOMUC at the FRMII in Munich enables the preparation as well as the characterization of the sample using PAES, XPS and STM. Financial support within the project no. 05KI0WOB by the BMBF is gratefully acknowledged.