1. Anhui Key Laboratory of Magnetic Functional Materials and Devices, School of Materials Science and Engineering, Anhui University, Hefei, Anhui, 230601, P. R. China
2. School of Physics and Electronic Information, Huaibei Normal University, Huaibei, 235000, P. R. China
3. School of Chemistry and Chemical Engineering, Anhui University, Hefei, 230601, P. R. China