1. Institute of Advanced Magnetic Materials College of Materials and Environmental Engineering Hangzhou Dianzi University Hangzhou 310012 P. R. China
2. School of Materials Science and Engineering Nanchang Hangkong University Nanchang 330063 P. R. China
3. Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences Hefei 230031 P. R. China
4. Division of Functional Material Central Iron and Steel Research Institute Beijing 100081 P. R. China