1. Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore
2. College of Electronic Science and Technology, Shenzhen University, Shenzhen 518060, P. R. China
3. Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
4. Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore 117603, Singapore
5. Department of Product, Test and Failure Analysis, GLOBALFOUNDRIES, Singapore Pte. Ltd., Singapore 738406, Singapore
6. Institute of Chemical and Engineering Sciences, A*STAR, 1 Pesek Road, Jurong Island, Singapore 627833, Singapore
7. Key Laboratory for Magnetism and Magnetic Materials of MOE, Key Laboratory of Special Function Materials and Structure Design of MOE, Lanzhou University, Lanzhou 730000, P. R. China
8. Data Storage Institute, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-01 Innovis, Singapore 138634, Singapore