1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China
2. Wuhan National High Magnetic Field Center and School of Physics Huazhong University of Science and Technology Wuhan 430074 P. R. China
3. Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 P. R. China