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arXiv · 2605.23624

Close correlation between giant magnetostriction and the microstructure in Fe-Ga melt-spun ribbons

Likun Chen·Mitsutaka Sato·Jiahao Han·Rie Y. Umetsu
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Abstract

Magnetoelastic anisotropy and <100> texture are crucial for promoting magnetostriction in Galfenol (Fe-Ga). Given that single-crystal Fe-Ga remains technically demanding and low magnetostriction of polycrystal, we explore melt-spun as an alternative, where rare-earth (RE) doping and cooling rates optimizing enable controllable <100> textured with required magnetoelastic anisotropy. Fe81Ga19 binary ribbons and RE-doped ribbons (0.2 at.% Pr, 1 at.% Pr and 1 at.% Ce) were fabricated at various cooling rates. Microstructural analyses reveal that RE elements preferentially dissolve into the matrix, while second-phase formation is suppressed at higher cooling rates. RE substitution increases the magnetostriction by enhancing magnetocrystalline distortion energy, while cooling rates act as an effective tuning knob to maximize the <100> texture. Notably, the decreased melting temperature associated with 1 at.% RE doping shifts the optimum texture to lower cooling rate compared with the binary alloy and 0.2 at.% RE doping sample. The magnetostriction as high as 688 ppm is achieved for the 1 at.% Ce doped ribbon fabricated at the speed of 1000 rotation per minute. These results demonstrate that RE-doped melt-spun ribbons are promising candidates for giant magnetostriction and establish a practical processing-texture-property guideline for designing highly magnetostrictive alloys.

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Likun Chen, Mitsutaka Sato, Jiahao Han, Rie Y. Umetsu. 2026-05-22. Close correlation between giant magnetostriction and the microstructure in Fe-Ga melt-spun ribbons. https://arxiv.org/abs/2605.23624

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