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DS: Fachverband Dünne Schichten

DS 26: Poster II

DS 26.45: Poster

Mittwoch, 25. März 2009, 09:30–12:30, P5

Ultrathin magnetite and pure iron films on MgO(100) studied by XRR and XPS — •Bernd Zimmermann¹, Oliver Höfert¹, Florian Bertram¹, Martin Suendorf¹, Carsten Deiter², Lars Böwer³, Michael Paulus³, Christian Sternemann³, and Joachim Wollschläger¹ — ¹Fachbereich Physik, Universität Osnabrück, Barbarastr. 7, D-49069 Osnabrück, Germany — ²HASYLAB at DESY, Notkestr. 85, D-22607 Hamburg, Germany — ³DELTA, TU Dortmund, Maria-Goeppert-Mayer-Straße 2, D-44227 Dortmund, Germany

Thin magnetic films offer a wide range of technological applications and are of current interest in the field of spintronics. Here iron should be used used as an example. Iron oxide as a transition metal oxide has a pool of geometrical configurations. Our films were prepared by molecular beam epitaxy on MgO (100) substrates at different temperatures. Magnesiumoxide was used as substrate to study these films on an insulator. We produced these films in UHV at above room temperature from Molecular Beam Epitaxy (MBE). For this purpose, pure iron was evaporated from a rod in low pressure oxygen atmosphere at 10⁻⁶ mbar and adsorbed on the substrates. We did this at room temperature and at 600K. Comparison of the significant XPS peak intensities gave us an estimation of the adsorbat thickness. Its crystallinity was verified by LEED. All films were protected by a silicon capping. The samples were studied with both X-Ray Reflectometry (XRR) at beamlines HASYLAB W1, BW2 and DELTA BL 9 with an energy of 10 keV respectively 15.5 keV and XPS at Osnabrück.