1. CAS Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China
2. Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China
3. School of Materials Science and Engineering Xiangtan University Xiangtan 411105 China
4. Faculty of Electrical Engineering and Computer Science Ningbo University Ningbo 315211 China
5. Nano Science and Technology Institute University of Science and Technology of China Suzhou 215123 China
6. Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China