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. Department of Physics and Astronomy, Clemson Nanomaterials Center and COMSET, Clemson University, Clemson, South Carolina 29634, United States
3. Key Laboratory of Nonferrous
Metal Chemistry and Resources
Utilization of Gansu Province and The Research Center of Biomedical Nanotechnology, Lanzhou University, Lanzhou 730000, PR China