1. College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
2. School of Science, Wuhan University of Technology, Wuhan 430070, China
3. Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, School of Physical Science & Technology, Lanzhou University, Lanzhou 730000, China
4. College of Physics and Electronics, Hunan University, Changsha 410082, China
5. School of Materials Science and Engineering, Beihang University, Beijing 100191, China