1. School of Physics
2. State Key Laboratory of Crystal Materials
3. Shandong University
4. Jinan 250100
5. China
6. Peter Grünberg Institut and Institute for Advanced Simulation
7. Forschungszentrum Jülich and JARA
8. 52425 Jülich
9. Germany
10. Department of Physics
11. University of Texas at Austin
12. Austin
13. USA
14. Department of Physics and Earth Science
15. Jacobs University Bremen
16. 28759 Bremen