1. School of Materials Science and Engineering, Taiyuan University of Technology 1 , Taiyuan 030024, China
2. School of Materials Science and Engineering, Taiyuan University of Science and Technology 2 , Taiyuan 030024, China
3. Laboratory of Magnetic and Electric Functional Materials and the Applications, The Key Laboratory of Shanxi Province 3 , Taiyuan 030024, China
4. Key Laboratory of Rare Earths, Ganjiang Innovation Academy, Chinese Academy of Sciences 4 , Ganzhou 341119, China
5. Department of Materials Science and Engineering, The University of Tennessee 5 , Knoxville, Tennessee 37996-2200, USA