Abstract
The prime objective of this work is to analyze the motion of magnetic domain walls (DWs) in a thin layer of magnetostrictive material that is perfectly attached to the upper surface of a thick piezoelectric actuator. In our analysis, we consider a transversely isotropic hexagonal subclass of magnetostrictive materials that demonstrate structural inversion asymmetry. To this aim, we utilize the one-dimensional extended Landau-Lifshitz-Gilbert equations, which describe the magnetization dynamics under the influence of various factors such as magnetic fields, spin-polarized electric currents, magnetoelastic effects, magnetocrystalline anisotropy, Rashba fields, and nonlinear dry-friction dissipation. By employing the standard traveling wave ansatz, we derive an analytical expression of the most relevant dynamic features: velocity, mobility, threshold, breakdown, and propagation direction of the DWs in both steady and precessional dynamic regimes. Our analytical investigation provides insights into how effectively the considered parameters can control the DW motion. Finally, numerical illustrations of the obtained analytical results show a qualitative agreement with the recent observations.
摘要
本文主要目的是分析磁致伸缩材料薄层中磁畴壁的运动, 这类材料可以完美附着在厚压电器的上表面. 我们的分 析中考虑了一类横观各向同性的六角形亚类磁致伸缩材料, 这些材料展示了结构反转非对称性. 为此, 我们利用了一维扩 展Landau-Lifshitz-Gilbert方程描述在磁场、自旋极化电流、磁弹性效应、磁晶各向异性、Rashba场和非线性干摩擦耗散等因素影响 下的磁化动力学. 通过标准的行波近似法, 我们推导出了最相关动态特性的解析表达式: 速度、迁移率、阈值、击穿和畴壁的传播方 向, 包括稳态和进动动态状态. 我们的解析研究提供了如何有效控制磁畴壁运动的参数的见解. 解析结果的数值模拟与近期的观测结 果定性上一致
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Acknowledgements
S. Dwivedi would like to thank the Science and Engineering Research Board (SERB), Department of Science and Technology, Government of India, and the National Institute of Technology Andhra Pradesh for the Financial Support (Grant Nos. CRG/2019/003101, NITAP/SDG/15/2020), respectively.
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Author contributions Sumit Maity: Conceptualization, Formal analysis, Investigation, Methodology, Software, Validation; Visualization, Writing–original draft, Writing–review & editing. Sarabindu Dolui: Formal analysis, Investigation, Methodology, Software, Writing–review & editing. Sharad Dwivedi: Conceptualization, Formal analysis, Investigation, Methodology, Software, Supervision; Project administration, Validation; Visualization, Writing–review & editing, Funding acquisition.
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Maity, S., Dolui, S. & Dwivedi, S. Strain-induced fast domain wall motion in hybrid piezoelectric-magnetostrictive structures with Rashba and nonlinear dissipative effects. Acta Mech. Sin. 40, 423613 (2024). https://doi.org/10.1007/s10409-024-23613-x
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DOI: https://doi.org/10.1007/s10409-024-23613-x