1. Key Laboratory of Magnetic Materials and Devices
2. Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology
3. Ningbo Institute of Materials Technology and Engineering
4. Chinese Academy of Sciences
5. Ningbo, P. R. China
6. Institute of Applied Chemistry
7. East China University of Science and Technology
8. Shanghai, China
9. Department of Physics
10. Ningbo University
11. Ningbo 315211, China