Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 91: Epitaxy and growth: Oxides and insulators
O 91.8: Vortrag
Donnerstag, 17. März 2011, 19:00–19:15, WIL C307
Photo electron spectroscopy study of the stoichiometric composition of ultrathin La0.67Sr0.33MnO3 films — •Åsmund Monsen1, Fei Song1, Justin Wells1, Jos Boschker2, Zheshen Li3, Roland Mathieu4, Matthias Hudl4, Per Nordblad4, Thomas Tybell2, and Erik Wahlström1 — 1Dept. of Physics, NTNU, Norway — 2Dept. of Electronics and Telecommunications, NTNU, Norway — 3Institute for Storage ring facilities Aarhus, Denmark — 4Dept. of Engineering Sciences, Uppsala University, Sweden
Ferromagnetic manganites, such as La0.67Sr0.33MnO3 (LSMO), have for a long time been prime candidates for spintronic devices. However, tunneling junctions have yet to display high resistive switching states at room temperature, and reports indicate reduced magnetic properties in ultrathin single films. These observations point towards altered layers at the interfaces.
In order to elucidate the physics of the interface regions we have studied structurally and magnetically well characterized LSMO, grown by pulsed laser deposition, thin films utilizing synchrotron based angle and energy dependent photo electron spectroscopy. We will present an analysis of depth dependent stoichiometry in films ranging from 20 nm down to a few unit cells in thickness. We will especially focus on any changes between surface, film and interface stoichiometry. Changes in valance band electron structure and the effect of the annealing based cleaning procedures will also be assessed.