1. Key Laboratory for Magnetism and Magnetic Materials of MOE, Key Laboratory of Special Function Materials and Structure Design of MOE, Lanzhou University, Lanzhou 730000, PR China
2. 320 kV Platform for Multi-Discipline Research with Highly Charged Ions at the Institute of Modern Physics, CAS, Lanzhou 730000, PR China
3. Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore