Dresden 2011 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 42: Poster I: Progress in Micro- and Nanopatterning: Techniques and Applications (jointly with O); Spins in Organic Materials; Ion Interactions with Nano Scale Materials; Organic Electronics and Photovoltaics; Plasmonics and Nanophotonics (jointly with HL and O); High-k and Low-k Dielectrics (jointly with DF); Organic Thin Films; Nanoengineered Thin Films; Layer Deposition Processes; Layer Properties: Electrical, Optical, and Mechanical Properties; Thin Film Characterisation: Structure Analysis and Composition; Application of Thin Films

DS 42.89: Poster

Mittwoch, 16. März 2011, 15:00–17:30, P1

Resonant Photoelectron Spectroscopy of epitaxial Fe-doped SrTiO₃ — •Annemarie Köhl¹, Christian Lenser¹, Jacek Szade², Dariusz Kajewski², Jurek Kubacki², Regina Dittmann¹, Kristof Szot¹, and Rainer Waser¹ — ¹Peter Grünberg Institut (PGI-7), Forschungszentrum Jülich, Germany — ²A.Chelkowski Institute of Physics, University of Silesia, Katowice, Poland

In recent years resistive switching in transition metal oxides received a lot of research interest due to the proposed application as non-volatile data memory. SrTiO₃ serves as a model system for investigation of resistive switching due to the valency change mechanism. Frequently slightly Fe doping is used, as it has shown to improve the switching properties.

Therefore the electronic structure of epitaxial Fe-doped SrTiO₃ was studied by photoelectron spectroscopy. Thin film samples with Fe concentration of 1 at.% and 2 at.% as well as undoped references are prepared by pulsed laser deposition and checked for surface quality by AFM. Core-level photoelectron peaks are analysed regarding the chemical shift and valence state. Resonant photoelectron spectroscopy at the absorption edge of Ti, O and Fe was used to determine the spectral contributions to the valence band. Most noteworthy we find significant spectral weight above the valence band, which can be attributed to Fe-states.