1. Guangxi Key Laboratory of Optical and Electronic Materials and Devices MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials College of Materials Science and Engineering Guilin University of Technology Guilin 541004 P. R. China
2. Spallation Neutron Source Science Center Dongguan 523803 P. R. China
3. Songshan Lake Materials Laboratory Dongguan 523808 P. R. China
4. Institute of Physics Chinese Academy of Sciences Beijing 100190 P. R. China
5. Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials College of Chemistry and Bioengineering Guilin University of Technology Guilin 541004 P. R. China