1. Fert Beijing Research Institute, MIIT Key Laboratory of Spintronics, School of Integrated Circuit Science and Engineering, Beihang University, Beijing 100191, People's Republic of China
2. Beihang-Goertek Joint Microelectronics Institute, Qingdao Research Institute, Beihang University, Qingdao 266101, People's Republic of China
3. Nanoelectronics Science and Technology Center, Hefei Innovation Research Institute, Beihang University, Hefei 230013, People's Republic of China
4. Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
5. Center for Emergent Matter Science, RIKEN, Wako, Saitama 351-0198, Japan