Berlin 2012 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 28: Thin film characterization: structure analysis and composition (Spectroscopy)
DS 28.7: Vortrag
Mittwoch, 28. März 2012, 19:15–19:30, H 2032
Structure determination of monolayer FeO(111) films on Ag(001) — •Daniel Bruns1, Irena Kiesel2, Steffen Jentsch1, Soeren Lindemann1, Christian Otte1, Timo Kuschel1, and Joachim Wollschlaeger1 — 1Fachbereich Physik, Universität Osnabrück, Barbarastr. 7, 49069 Osnabrück — 2Technische Universität Dortmund, Fakultät Physik/DELTA, Maria-Goeppert-Mayer-Str. 2, 44227 Dortmund
Ultra thin iron oxide films were grown on Ag(001) via reactive molecular beam epitaxy (metal deposition in oxygen atmosphere). The first monolayer shows FeO stoichiometry as concluded from x-ray photoemission spectra. Both low energy electron diffraction and scanning tunneling microscopy demonstrate that the FeO layer has quasi-hexagonal symmetry. This points to the growth of FeO(111) although the films is deposited on a surface with square symmetry. The periodicity as well as the height of the undulated FeO(111) film was analyzed by STM and SPA-LEED. The FeO(111) lattice is slightly rotated with respect to the Ag(001) substrate surface. This rotation causes an undulation of the oxide layer in two different directions with different undulation heights.