Magnetostriction and microstructure of melt-spun Fe77Ga23 ribbons prepared with different wheel velocities
(1. Key Laboratory of Soft Chemistry and Functional Materials, Ministry of Education,
Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, China;
2. Department of Applied Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China;
3. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
4. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China;
5. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China)
Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, China;
2. Department of Applied Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China;
3. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
4. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China;
5. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China)
Abstract: A set of stacked ribbons with the composition of Fe77Ga23 were prepared with different wheel velocities of 7 m/s, 12.5 m/s and 25 m/s (named as S7, S12.5 and S25, respectively). High resolution X-ray diffraction patterns of these ribbons show that all the ribbons present the disordered A2 structure, whereas an additional modified-DO3 phase is detected in S12.5 and S25. S25 has stronger (100) texture than other two samples. Ga K-edge extended X-ray absorption fine structure results indicate that both bond distance and the number of Ga atoms in the second neighbor shell around Ga decrease with increasing wheel velocity. No Ga cluster is detected in the studied ribbons. A short-range ordering Ga-rich phase and large local strain have no obvious influence on magnetostriction of S7. It is believed that both the (100) texture and the additional modified-DO3 phase play a positive role in magnetostrictive properties of Fe77Ga23 ribbons.
Key words: magnetostriction; texture; modified-DO3 phase; melt-spun Fe77Ga23 ribbon