1. Department of Materials Science and Engineering; College of Engineering; Peking University; Beijing 100871 China
2. Department of Materials Science and Engineering; NTNU Norwegian University of Science and Technology; Trondheim 7491 Norway
3. BIC-ESAT; College of Engineering; Peking University; Beijing 100871 China
4. Beijing Key Laboratory for Magnetoeletric Materials and Devices (BKL-MEMD); Peking University; Beijing 100871 China
5. Department of Energy and Resources Engineering; College of Engineering; Peking University; Beijing 100871 China