1. Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-sen University, Guangzhou 510275, China
2. School of Physics and Centre for Physical Mechanics and Biophysics, School of Physics, Sun Yat-sen University, Guangzhou 510275, China
3. Center for Neutron Science and Technology, School of Physics, Sun Yat-sen University, Guangzhou 510275, China
4. State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-sen University, Guangzhou 510275, China
5. School of Materials, Sun Yat-sen University, Shenzhen 518107, China