1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China
2. University of Chinese Academy of Sciences, Beijing 100049, P. R. China
3. Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou 730000, P. R. China
4. Advanced Energy Science and Technology Guangdong Laboratory, Huizhou 516000, P. R. China
5. Huizhou Research Center of Ion Sciences, Huizhou 516000, P. R. China