1. Physics Department and I3N, University of Aveiro, Aveiro 3810-193, Portugal
2. Institut für Werkstoffe der Elektrotechnik II, RWTH Aachen University, Aachen 52074, Germany
3. I. Physikalisches Institut IA, RWTH Aachen University, Aachen 52074, Germany
4. Peter Grünberg Institute and JARA-FIT, Forschungszentrum Jülich, Jülich 52428, Germany
5. National University of Science and Technology “MISiS,” Moscow 119049, Russia