磁致伸缩材料中通过弹性阻尼驱动磁畴壁
Propulsion of magnetic domain walls via elastic damping in magnetostrictive materials
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中文总结 AI 辅助
本文研究磁致伸缩材料中磁畴壁与弹性形变的耦合，发现机械阻尼可在无吉尔伯特阻尼时驱动畴壁稳态运动，为声学自旋电子器件提供新控制机制。
中文摘要 AI 辅助
磁性与弹性自由度之间的相互作用在先进自旋电子学技术中日益成为核心。在磁致伸缩材料中，移动的磁畴壁携带着局部的弹性形变。在此，我们利用完全耦合的微磁-弹性动力学框架和分析性集体坐标模型，研究了这些弹性形变及其对场驱动磁畴壁动力学的反作用。我们表明，机械阻尼作为一个非磁性耗散通道，从磁织构中提取能量，并即使在完全没有本征吉尔伯特阻尼（α=0）的情况下也能维持磁畴壁的平移运动。具体而言，弹性阻尼对磁畴壁动力学的影响方式与磁损耗等效，使我们能够将其映射为吉尔伯特阻尼参数α_me的有效磁弹性贡献。我们计算了与磁畴壁共动的局域应力张量分布，并表明机械耗散打破了它们的空间对称性。利用我们的集体坐标模型，我们证明这些不对称的应力分布——特别是跨越畴壁核心的局域应力梯度——施加直接的推进力，平衡了场诱导的磁进动，从而实现稳态运动。总体而言，这些发现揭示了磁性与弹性子系统之间的一种基本能量转移和弛豫机制，为通过应变工程和机械阻尼设计在声学自旋电子器件中控制磁织构动力学提供了宝贵的见解。
英文摘要
The interaction between magnetic and elastic degrees of freedom is increasingly central to advanced spintronics technology. In magnetostrictive materials, a moving domain wall carries a localized elastic deformation. Here, we investigate these elastic deformations and their back-action on field-driven domain wall dynamics using a fully coupled micromagnetic-elastodynamic framework and an analytical collective coordinates model. We show that mechanical damping acts as a non-magnetic dissipation channel, extracting energy from the magnetic texture and sustaining translational domain wall motion even in the complete absence of intrinsic Gilbert damping ($α=0$). Specifically, elastic damping impacts domain wall dynamics in a manner equivalent to magnetic losses, allowing us to map it onto an effective magnetoelastic contribution to the Gilbert damping parameter, $α_\text{me}$. We calculate the localized stress tensor profiles co-moving with the domain wall and show that mechanical dissipation breaks their spatial symmetry. Using our collective coordinates model, we demonstrate that these asymmetric stress profiles-specifically the localized stress gradients across the wall core-exert direct propelling forces that balance field-induced magnetic precession, enabling steady-state motion. Overall, these findings reveal a fundamental energy transfer and relaxation mechanism between magnetic and elastic subsystems, providing valuable insights for controlling magnetic texture dynamics via strain engineering and mechanical damping design in acoustic spintronic devices.
发表机构
- Universidad de Salamanca（萨拉曼卡大学）
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