Tuning magnetostriction of Fe-Ga alloys via stress engineering

JOURNAL OF ALLOYS AND COMPOUNDS

卷:822

Article

Ke, Yubin^1,2  Wu, Hong-Hui³  Lan, Si⁴  Jiang, Hanqiu²  Ren, Yang⁵  Liu, Sinan⁴  Jiang, Chengbao¹ 

[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

[2] Chinese Acad Sci, IHEP, Spallat Neutron Source Sci Ctr, Dongguan 523808, Peoples R China

[3] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing Adv Innovat Ctr Mat Genome Engn, Beijing, Peoples R China

[4] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Herbert Gleiter Inst Nanosci, 200 Xiaolingwei Ave, Nanjing, Peoples R China

[5] Adv Photon Source, Argonne Natl Lab, Xray Sci Div, 9700 South Cass Ave, Argonne, IL 60439 USA

关键词: Magneto-elastic coupling;    Fe-Ga alloy;    Tb doping;    Magnetostriction;    Stress;    Nanoscale precipitate;   

DOI  :  10.1016/j.jallcom.2020.153687

来源: Elsevier

【 摘 要 】

Stress has a strong impact on the magnetization and magnetostriction of magnetic materials due to the magneto-elastic coupling. It offers a clue to understand the 2-5 times enhancement on the magnetostriction of Fe-Ga alloys with rare-earth elements doping. In this article, the stress states of melt-quenched and melt-spun (Fe0.83Ga0.17)(100-x)Tb-x (x = 0-0.47) alloys were measured by high energy X-ray diffraction (XRD) and X-ray absorption fine structure (XAFS) technique. The macroscopic residual and microscopic stress of different Tb doped alloys were deduced from the shift and broadening of diffraction peaks and the deviation of the identified 1st Fe-Fe and 2nd Ga-Ga bond length. Rietveld refinement confirmed that the dissolved Tb atoms can replace the Fe/Ga site while small-angle neutron scattering (SANS) showed the presence of Tb-rich nanoscale precipitates. The effect of external stress loading and Tb doping on magnetization and magnetostriction of the modified Fe-Ga alloys was compared and discussed. We propose that the magnetization and magnetostriction of Fe-Ga alloys can be controlled through stress engineering by manipulating the magnetic domain structure through chemical doping or mechanical loading. (C) 2020 Published by Elsevier B.V.

【 授权许可】

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