1. School of Material Science and Engineering, Hebei University of Technology, 29 Guangrong dao, Hongqiao District, Tianjin 300130, China
2. CAS Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
3. Ningbo University of Technology, Ningbo 315211, China
4. Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China