1. Modern Magnetic Systems Max Planck Institute for Intelligent Systems Heisenbergstraße 3 70569 Stuttgart Germany
2. Faculty of Physics Adam Mickiewicz University ul. Uniwersytetu Poznańskiego 2 61-614 Poznań Poland
3. Institute of Molecular Physics Polish Academy of Sciences Mariana Smoluchowskiego 17 60-179 Poznań Poland
4. Helmholtz-Zentrum Berlin Albert-Einstein-Straße 15 12489 Berlin Germany
5. Laboratory for Condensed Matter Paul Scherrer Institute Forschungsstrasse 111 5232 Villigen PSI Switzerland
6. Institute of Physics Johannes Gutenberg-Universität Mainz Staudingerweg 7 55128 Mainz Germany