1. Department of Materials Science and EngineeringCenter for Spintronics and Quantum SystemsState Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong University Xi'an Shaanxi 710049 China
2. Department of Materials Science and EngineeringNational Laboratory of Solid State MicrostructuresNanjing University Nanjing Jiangsu 210093 China
3. Jiangsu Key Laboratory of Artificial Functional MaterialsNanjing University Nanjing Jiangsu 210093 China