1. Hefei Innovation Research Institute, Beihang University, Hefei 230013, China
2. Graduate School of Materials Science, National Yunlin University of Science and Technology, Douliou 64002, Taiwan
3. Fert Beijing Institute, BDBC, and the School of Integrated Circuit Science and Engineering, Beihang University, Beijing 100191, China
4. Department of Physics, National Taiwan University, Taipei 10617, Taiwan