1. York-Nanjing Joint Center for Spintronics and Nano Engineering
(YNJC), School of Electronics Science and Engineering, Nanjing University, Nanjing 210093, China
2. Spintronics and Nanodevice Laboratory, Department of Electronics, University of York, York YO10 5DD, United Kingdom
3. Department of Electrical Engineering, University of California, Los
Angeles, California 90095, United States
4. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
5. Diamond Light Source, Didcot OX11 0DE, United Kingdom