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Tailoring coercive field in rare earth giant magnetostrictive materials by α-Fe precipitation

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Abstract

Rare earth giant magnetostrictive materials (GMMs) Tb1−xDyxFe2±δ (Tb–Dy–Fe) have been successfully employed in many microelectromechanical devices due to their excellent magnetostrictive properties at room temperature. However, Tb–Dy–Fe still shows a relatively large coercivity with high hysteresis, which inevitably limits its application range. Herein, micromagnetic simulations are performed to investigate the size effect of precipitated phase (α-Fe) on coercivity in Tb–Dy–Fe. Simulation results demonstrate that the coercivity is reduced from 31.46 to 12.48 mT with increasing the size of α-Fe from 4 to 50 nm in Tb–Dy–Fe since the precipitated phase of α-Fe can act as a magnetization reversal nucleus. This decreasing trend of coercivity can be well fitted with an inverse square relationship, which agrees well with the nucleation theory. Our study highlights that the coercivity of Tb–Dy–Fe can be tailored by tuning the size of α-Fe precipitation.

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摘要

稀土超磁致伸缩材料 (GMMs) Tb1−xDyxFe2±δ (Tb–Dy–Fe)因其具有优异的室温磁致伸缩性能, 已成功应用于诸多微机电器件中。然而, Tb–Dy–Fe仍然表现出较大的矫顽力和高磁滞效应, 这不可避免地限制了它的应用范围。有鉴于此, 开展了微磁学模拟以研究析出相 (α-Fe) 尺寸对 Tb–Dy–Fe 矫顽力的影响。模拟结果表明, 随着 α-Fe 在 Tb–Dy–Fe 中的尺寸从 4 nm 增加到50 nm, 因 α-Fe析出相可以充当反磁化核, 矫顽力则相应地从 31.46 mT 降低到12.48 mT。矫顽力的下降趋势可以很好地拟合成平方反比关系, 并且也很好地符合形核场理论。本研究表明, 可以通过改变析出相 α-Fe的大小来有效调控Tb–Dy–Fe 的矫顽力。

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Acknowledgements

This work was financially supported by the National Key R&D Program of China (No. 2021YFB3501401), the National Natural Science Foundation of China (No. 52001103), Zhejiang Provincial Natural Science Foundation of China (No. LQ21E010001) and the Ten Thousand Talents Plan of Zhejiang Province of China (No. 2019R52014).

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  1. Division of Microelectronic Materials and Devices, Hangzhou Dianzi University, Hangzhou, 310018, China

    Fang-Xian Zhang, Peng-Qiang Hu, Zheng-Ming Zhang, Jian-Hu Gong & Dun-Hui Wang

  2. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China

    Zheng-Ming Zhang & Dun-Hui Wang

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Zhang, FX., Hu, PQ., Zhang, ZM. et al. Tailoring coercive field in rare earth giant magnetostrictive materials by α-Fe precipitation. Rare Met. 42, 606–613 (2023). https://doi.org/10.1007/s12598-022-02145-4

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