1. Key Laboratory for Magnetism and Magnetic Materials of MOE
2. Key Laboratory of Special Function Materials and Structure Design of MOE
3. Lanzhou University
4. Lanzhou 730000
5. P. R. China
6. Department of Material Science and Engineering
7. National University of Singapore
8. Singapore
9. Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
10. The Research Center of Biomedical Nanotechnology
11. Lanzhou
12. Institute of Chemical and Engineering Sciences
13. A*STAR
14. Jurong Island