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, People’s Republic of China
2. Department
of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575
3. Key
Laboratory of Nonferrous Metal Chemistry and Resources Utilization
of Gansu Province and The Research Center of Biomedical Nanotechnology, Lanzhou University, Lanzhou, 730000, People’s Republic of China
4. Institute of Chemical and Engineering Sciences, A*STAR, 1 Pesek Road, Jurong
Island 627833, Singapore