1. Department of Physics; University of Basel; Klingelbergstrasse 82 4056 Basel Switzerland
2. Centro de Física de Materiales (CSIC/UPV-EHU)-Materials Physics Center; Manuel Lardizabal 5 20018 San Sebastián Spain
3. Laboratory for Micro- and Nanotechnology; Paul Scherrer Institute; 5232 Villigen PSI Switzerland
4. PRESTO; Japan Science and Technology Agency (JST); 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan
5. Donostia International Physics Center (DIPC); Manuel Lardizabal 4 20018 San Sebastián Spain
6. Departamento de Física Aplicada; Instituto de Física Gleb Wataghin; Universidade Estadual de Campinas; Campinas 13083-859 Brazil
7. Zernike Institute for Advanced Materials; University of Groningen; Nijenborgh 4 9747 AG Groningen The Netherlands
8. Departamento Física Aplicada I; Universidad del País Vasco; 20018 San Sebastián Spain
9. Department of Physics; Chemistry and Biology; IFM; Linköping University; Linköping 581 83 Sweden
10. Anorganisch-Chemisches Institut; Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
11. Instituto de Ciencia de Materiales de Aragón (ICMA); CSIC-Universidad de Zaragoza; E-50009 Zaragoza Spain
12. Departamento de Física de la Materia Condensada; Universidad de Zaragoza; E-50009 Zaragoza Spain