1. Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstr. 20, 01069 Dresden, Germany
2. Department of Cell Biology, Faculty of Biology, Universität Bielefeld, Universitätsstraße 25, 33615 Bielefeld, Germany
3. Institute of Materials Science, Technische Universität Bergakademie Freiberg, Gustav-Zeuner-Str. 5, 09599 Freiberg, Germany
4. Department of Thin Films and Physics of Nanostructures, Center of Spinelectronic Materials and Devices, Faculty of Physics, Universität Bielefeld, Universitätsstraße 25, 33615 Bielefeld, Germany