1. Beijing Key Laboratory for Magnetoelectric Materials and Device (BKLMMD), Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
2. College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
3. International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba 305-0044, Japan