1. Department of Physics, School of Science, Lanzhou University of Technology 1 , Lanzhou 730050, China
2. Lanzhou Center for Theoretical Physics, Key Laboratory of Theoretical Physics of Gansu Province, Lanzhou University 2 , Lanzhou 730000, China
3. Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University 3 , Lanzhou 730000, China