1. Beijing Key Laboratory for Magnetoelectric Materials and Devices (BKL-MMD), School of Materials Science and Engineering, Peking University, Beijing 100871, China
2. Department of Ultrasound, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China
3. Department of Radiology, The Fifth Medical Center of Chinese PLA General Hospital, Beijing 100039, China
4. Institute of Spin-X Science and Technology, South China University of Technology, Guangzhou 510641, China