1. Key Laboratory of Microelectronic Devices and Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences (IMECAS) 1 , Beijing 100029, China
2. University of Chinese Academy of Sciences (UCAS) 2 , Beijing 100049, China
3. Songshan Lake Materials Laboratory 3 , Dongguan, Guangdong 523808, China
4. Institute of Physics, Chinese Academy of Sciences 4 , Beijing 100190, China
5. Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University 5 , Lanzhou 730000, China