1. National Key Lab of Spintronics, Institute of International Innovation, Beihang University 1 , Yuhang District, Hangzhou 311115, China
2. Nanoelectronics Science and Technology Center, Hefei Innovation Research Institute, Beihang University 2 , Hefei 230013, People's Republic of China
3. Fert Beijing Research Institute, MIIT Key Laboratory of Spintronics, School of Integrated Circuit Science and Engineering, Beihang University 3 , Beijing 100191, People's Republic of China
4. National Synchrotron Radiation Laboratory, University of Science and Technology of China 4 , Hefei 230029, People's Republic of China