1. Key Laboratory of Interfacial Physics and Technology, Shanghai Synchrotron Radiation Facility and Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
2. Department of Physics, Zhejiang University, Hangzhou 310027, China
3. University of Chinese Academy Sciences, Beijing 100200, China
4. School of Physics Science and Technology, ShanghaiTech University, Shanghai 201210, China
5. Institute of Physics, Chinese Academy of Sciences, Beijing 100100, China
6. School of Physics and Electronics, Central South University, Changsha 410083, China
7. Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, Trondheim NO-7491, Norway