1. Department of Physics, Budapest University of Technology and Economics and Nanoelectronics “Momentum” Research Group of the Hungarian Academy of Sciences, Budafoki út 8, 1111 Budapest, Hungary
2. Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
3. Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
4. International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
5. Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, D-86159 Augsburg, Germany