1. National Key Laboratory of Spintronics, Hangzhou International Innovation Institute, Beihang University, Hangzhou 311115, China.
2. Truth Instruments Co.Ltd., Qingdao 266104, China.
3. Fert Beijing Institute, MIIT Key Laboratory of Spintronics, School of Integrated Circuit Science and Engineering,
Beihang University, Beijing 100191, China.
4. Laboratory of Microelectronics, Qingdao Research Institute of Beihang University, Qingdao 266104, China.