1. Key Laboratory for Magnetism and Magnetic Materials of MOE Key Laboratory of Special Function Materials and Structure Design of MOE Lanzhou University Lanzhou 730000 China
2. Institute of Nanoscience and Nanotechnology School of Materials and Energy Lanzhou University Lanzhou 730000 China
3. Department of Obstetrics and Gynecology Key Laboratory for Gynecologic Oncology Gansu Province The First Hospital of Lanzhou University Lan Zhou 730022 China