1. Institute for Theoretical Solid State Physics RWTH Aachen University 52056 Aachen Germany
2. I. Institute of Physics (IA) RWTH Aachen University 52056 Aachen Germany
3. JARA‐FIT and JARA‐HPC RWTH Aachen University 52056 Aachen Germany
4. Peter Grünberg Institute (PGI 10) Forschungszentrum Jülich GmbH 52428 Jülich Germany
5. Department of Physics Sapienza Università di Roma Piazzale Aldo Moro 2 Roma 00185 Italy