1. School of Microelectronics, Beijing Advanced Innovation Center for Big Data and Brain Computing, Fert Beijing Research Institute, Beihang University, Beijing 100191, China
2. Beihang-Geortek Joint Microelectronics Institute, Qingdao Research Institute, Beihang University, Qingdao 266100, China
3. School of Electronics and Information Engineering, Beihang University, Beijing 100191, China