1. Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, Centre for Physical Mechanics and Biophysics, School of Physics, Sun Yat-sen University, Guangzhou 510275, China
2. Department of Materials Science & Engineering, National University of, Singapore, 9 Engineering Drive 1, 117576, Singapore
3. Singapore Synchrotron Light Source (SSLS), National University of Singapore, 5 Research Link, 117603, Singapore