Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)
MA 63.30: Poster
Freitag, 18. März 2011, 11:00–14:00, P2
An oxide MBE system for quasi in-situ neutron reflectometry studies — •Sabine Pütter1, Alexander Weber2, Alfred Richter1, Ulrich Rücker2, Stefan Mattauch1, Aleander Ioffe1, and Thomas Brückel1,2 — 1Jülich Centre for Neutron Science am FRM II, Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85747 Garching — 2Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, 52425 Jülich
A state-of-the-art oxide-MBE (Molecular Beam Epitaxy) system has been commissioned at the Jülich Centre for Neutron Science (JCNS) in 2010. It is designed to create high quality epitaxial thin films and heterostructures of complex oxides utilizing co-deposition and in-situ oxidation for quasi in-situ neutron scattering studies at the new dedicated MAgnetism Reflectometer with high Incident Angle (MARIA) of the JCNS by transferring the sample in a UHV transport chamber to the neutron beam.
We report on progress in the fabrication of systems of metal and complex oxide thin films like [Cr/Fe]x/GaAs and La1−xSrxMnO3/SrTiO3, respectively, with the fine control of stoichiometry, morphology, and thickness. We have carried out careful calibration of the deposition rates of the constituent elements by reflective high energy electron diffraction intensity oscillations, Auger intensity analysis and ex-situ X-Ray diffraction. Annealing steps have been optimized to obtain atomically smooth films which have been checked with atomic force microscopy.