1. Department of Materials Science and EngineeringNational University of Singapore Singapore 117575 Singapore
2. Department of Electronic MaterialInstitute of Material Research and EngineeringA*STAR Singapore 138634 Singapore
3. Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsUniversity of Chinese Academy of SciencesChinese Academy of Sciences Beijing 100190 China
4. CAS Key Laboratory of Magnetic Materials and DevicesNingbo Institute of Materials Technology and EngineeringChinese Academy of Sciences Ningbo 315201 China
5. Singapore Synchrotron Light SourceNational University of Singapore Singapore 117575 Singapore
6. College of electronics and informationHangzhou Dianzi University Hangzhou 310018 China
7. Suzhou Research InstituteNational University of Singapore Suzhou 215123 China