[1] Tianjin Univ Sci & Technol, Sch Sci, Tianjin 300222, Peoples R China
[2] Chinese Acad Sci, State Key Lab Magnetism, Inst Phys, Beijing 100190, Peoples R China
[3] Chinese Acad Sci, Ctr Condensed Matter Phys, Beijing 100190, Peoples R China
[4] Hebei Univ Technol, Sch Mat Sci & Engn, Tianjin 300130, Peoples R China