1. Faculty of Physics, University of Vienna 1 , A-1090 Vienna, Austria
2. CEITEC BUT, Brno University of Technology 2 , 612 00 Brno, Czech Republic
3. Vienna Doctoral School in Physics, University of Vienna 3 , A-1090 Vienna, Austria
4. Institute of Magnetism 4 , Kyiv 03142, Ukraine
5. INNOVENT e.V. Technologieentwicklung 5 , Prüssingstraße 27B, 07745 Jena, Germany