1. Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University, No. 92 Weijin Road, Nankai District, Tianjin 300072, China
2. The Key Laboratory for Magnetism and Magnetic Materials, Lanzhou University, Lanzhou 730000, People's Republic of China
3. Faculty of Science, Jiujiang University, Jiujiang City 332005, Jiangxi Province, China