1. Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, and Jülich Aachen Research Alliance (JARA) − Fundamentals of Future Information Technology, 52425 Jülich, Germany
2. Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Strasse 46, 67663 Kaiserslautern, Germany
3. Graduate School of Excellence Materials Science in Mainz, Erwin-Schrödinger-Strasse 46, 67663 Kaiserslautern, Germany
4. Diamond Light Source, Harwell Science and Innovation Campus, Oxfordshire OX11 0DE, U.K.