1. Faculty of Materials Science and Engineering; Kunming University of Science and Technology; Kunming 650093 P. R. China
2. CAS Key Laboratory of Magnetic Materials and Devices; Ningbo Institute of Materials Technology and Engineering; Chinese Academy of Sciences; Ningbo 315201 P. R. China
3. Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology; Ningbo Institute of Materials Technology and Engineering; Chinese Academy of Sciences; Ningbo 315201 P. R. China
4. College of Materials Science and Opto-Electronic Technology; University of Chinese Academy of Sciences; Beijing 100049 P. R. China
5. State Key Laboratory of Fluid Power and Mechatronic System; Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province; Department of Engineering Mechanics; Zhejiang University; Hangzhou 310027 China