Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session I (Metal, semiconductor and oxide substrates: structure and adsorbates; Graphene)
O 35.36: Poster
Dienstag, 12. März 2013, 18:15–21:45, Poster B1
Temperature depending formation of ultrathin FeO(111) films on Ag(111) — •Sören Richard Lindemann, Daniel Bruns, and Joachim Wollschläger — Universität Osnabrück, Fachbereich Physik, Barbarastraße 7, 49076 Osnabrück
Iron oxides are used in various applications in spintronic devices and heterogenous catalysis. Therefore, the preparation and characterisation of thin and ultrathin iron oxide films on different metal substrates stand in the focus of current research. In this study ultrathin iron oxide films were grown on Ag(111) by subsequent deposition of Fe films at room temperature, which is followed by annealing in 10−5 mbar O2 atmosphere at 150∘C for 10 minutes to oxidize the submonolayer films. These films were post-deposition annelead at elevated temperatures in Ultra High Vacuum (UHV) to increase the order inside the film lattice. Structure, morphology and chemical composition of the films were investigated before and after this temperature treatment by Spot Profile Analysis Low Energy Electron Diffraction (SPA-LEED) and Auger Electron Spectroscopy (AES). Although the diffraction patterns suggest an increase of order at the surface due to annealing, a segregation of silver was observed via AES for temperatures above 300∘C. For an annealing temperature of 400∘C coexisting FeO(111) and Ag(111) domains at the surface were found with SPA-LEED.