1. Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China
2. Institute of Physics Chinese Academy of Sciences Beijing 100190 China
3. School of Physics University of Chinese Academy of Sciences Beijing 100049 China
4. State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China
5. Institute MIIT Key Laboratory of Spintronics School of Integrated Circuit Science and Engineering Beihang University Beijing 100191 China