1. School of Physical Science and Technology, Bohai University, Jinzhou 121013, China
2. Institute of Materials Science, Technical University of Darmstadt, Alarich-Weiss-Str. 2, 64287 Darmstadt, Germany
3. School of Science, Inner Mongolia University of Science and Technology, Baotou 014010, China
4. Key laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China
5. State Key Laboratory of Metastable Materials Science & Technology and College of Science, Yanshan University, Qinhuangdao 066004, China
6. Department of Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China