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Open AccessArticle

Giant Enhancement of Magnetostrictive Response in Directionally-Solidified Fe83Ga17Erx Compounds

1
College of Engineering, Northeastern University, Boston, MA 02115, USA
2
Institute of Experimental Physics, Saarland University, 66123 Saarbrucken, Germany
3
Baotou Research Institute of Rare Earths, Baotou 014010 China
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(6), 1039; https://doi.org/10.3390/ma11061039
Received: 19 May 2018 / Revised: 7 June 2018 / Accepted: 8 June 2018 / Published: 19 June 2018
(This article belongs to the Special Issue Magnetostrictive Composite Materials)
We report, for the first time, correlations between crystal structure, microstructure and magnetofunctional response in directionally solidified [110]-textured Fe83Ga17Erx (0 < x < 1.2) alloys. The morphology of the doped samples consists of columnar grains, mainly composed of a matrix phase and precipitates of a secondary phase deposited along the grain boundary region. An enhancement of more than ~275% from ~45 to 170 ppm is observed in the saturation magnetostriction value (λs) of Fe83Ga17Erx alloys with the introduction of small amounts of Er. Moreover, it was noted that the low field derivative of magnetostriction with respect to an applied magnetic field (i.e., dλs/dHapp for Happ up to 1000 Oe) increases by ~230% with Er doping (dλs/dHapp,FeGa= 0.045 ppm/Oe; dλs/dHapp,FeGaEr= 0.15 ppm/Oe). The enhanced magnetostrictive response of the Fe83Ga17Erx alloys is ascribed to an amalgamation of microstructural and electronic factors, namely: (i) improved grain orientation and local strain effects due to deposition of Er in the intergranular region; and (ii) strong local magnetocrystalline anisotropy, due to the highly anisotropic localized nature of the 4f electronic charge distribution of the Er atom. Overall, this work provides guidelines for further improving galfenol-based materials systems for diverse applications in the power and energy sector. View Full-Text
Keywords: iron-gallium; magnetostriction; rare-earth doped FeGa iron-gallium; magnetostriction; rare-earth doped FeGa
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MDPI and ACS Style

Barua, R.; Taheri, P.; Chen, Y.; Koblischka-Veneva, A.; Koblischka, M.R.; Jiang, L.; Harris, V.G. Giant Enhancement of Magnetostrictive Response in Directionally-Solidified Fe83Ga17Erx Compounds. Materials 2018, 11, 1039.

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