1. School of Materials Science and EngineeringHarbin Institute of Technology Shenzhen 518055 China
2. Institute of Applied PhysicsGraduate School of Pure and Applied SciencesUniversity of Tsukuba Tsukuba 305–8573 Japan
3. Department of Precision InstrumentTsinghua University Beijing 100084 China
4. School of Materials Science and EngineeringShanghai Jiao Tong University Shanghai 200030 China
5. Research and Utilization DivisionJapan Synchrotron Radiation Research Institute (JASRI/SPring‐8) Sayo Hyogo Japan
6. PRESTOJapan Science and Technology Agency Saitama 332‐0012 Japan
7. Department of Materials Science and EngineeringJohns Hopkins University Baltimore MD 21218 USA