1. National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei Anhui 230026 China
2. Materials Science Division Argonne National Laboratory Argonne IL 60439 USA
3. Advanced Photon Source Argonne National Laboratory Argonne IL 60439 USA
4. Department of Materials Science and Engineering China University of Petroleum Beijing 102202 China
5. High Magnetic Field Laboratory Chinese Academy of Sciences (CAS) Hefei 230026 China
6. Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China Hefei 230026 China
7. Beijing Advanced Sciences and Innovation Center Chinese Academy of Sciences Beijing 101407 China