1. Beijing Key Laboratory for Magnetoelectric Materials and Devices (BKL-MMD), School of Materials Science and Engineering, Peking University, Beijing 100871, China
2. Peking University-Tsinghua University-National Institute of Biological Sciences Joint Graduate Program, School of Life Sciences, Peking University, Beijing 100871, China
3. Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, China
4. Center for Nanoscale Science and Technology, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
5. Fifth Medical Center of Chinese PLA General Hospital, Beijing 100039, China
6. Department of Ultrasound, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China
7. College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China