1. Key Laboratory of Magnetism and Magnetic Materials of the Ministry of Education School of Physical Science and Technology Lanzhou University Lanzhou 730000 China
2. State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry CAS Changchun 130022 China
3. University of Science and Technology of China Hefei 230026 China
4. Research Institute of Chemical Defense Beijing 100191 China