1. Key Laboratory of Polar Materials and Devices (MOE) and Technical Center for Multifunctional Magneto-Optical Spectroscopy (Shanghai)
2. Department of Electronics Engineering
3. East China Normal University
4. Shanghai 200241
5. China
6. Peter Grünberg Institute 9 (PGI-9) and Jülich-Aachen Research Alliance (JARA)-Fundamentals of Future Information Technology
7. Forschungszentrum Jülich GmbH
8. 52425 Jülich
9. Germany
10. School of Physics and Materials Science