1. Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, 7491 Trondheim, Norway
2. Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich, Jülich 52425, Germany
3. Faculty of Physics, University of Duisburg-Essen, Duisburg 47057, Germany
4. Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway
5. Ruprecht Haensel Laboratory, Kiel University, 24098 Kiel, Germany
6. Ruprecht Haensel Laboratory, DESY, 22607 Hamburg, Germany
7. Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
8. Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
9. Department of Physics, National Taiwan University, Taipei 10617, Taiwan
10. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
11. Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
12. Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
13. Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich, 52425 Jülich, Germany