二维圆柱形铁磁表面上磁畴与畴壁的几何约束
Geometrical Confinement of Magnetic Domains and Domain Walls on Two-Dimensional Cylindrical-Shaped Ferromagnetic Surfaces
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中文总结 AI 辅助
本研究通过解析模型与模拟，揭示二维圆柱形铁磁表面曲率可压缩畴壁宽度，并在CrSBr纳米管中实现稳定畴约束，为自旋电子学提供新平台。
中文摘要 AI 辅助
将二维（2D）范德华（vdW）磁性单层卷曲成圆柱形结构，为在无边缘钉扎效应的情况下约束磁畴壁（DWs）提供了理想平台。在此，我们提出了一项关于铁磁（FM）纳米管中畴壁约束与相互作用的解析与数值相结合的研究。利用二维矩形晶格上的解析海森堡模型，我们表明横向曲率引入了方位角交换能惩罚，从而内在压缩畴壁宽度。该模型与原子级Landau-Lifshitz-Gilbert（LLG）自旋动力学模拟显示出极好的定量一致性。通过将研究扩展到实际的CrSBr（CSB）纳米管，我们模拟了由长程偶极吸引与短程交换排斥平衡而产生的两个相互作用畴壁的束缚态。微磁模拟揭示了壁间距离随管周长的非单调演化。这些发现凸显了vdW磁性纳米管作为准一维自旋电子学架构中稳定畴约束的稳健平台。
英文摘要
The rolling of two-dimensional (2D) van der Waals (vdW) magnetic monolayers into cylindrical architectures provides an ideal platform for confining magnetic domain walls (DWs) without edge-pinning effects. Here, we present a combined analytical and numerical investigation of DW confinement and interaction in ferromagnetic (FM) nanotubes. Using an analytical Heisenberg model on a 2D rectangular lattice, we show that transversal curvature introduces an azimuthal exchange energy penalty that intrinsically compresses the DW width. This model demonstrates excellent quantitative agreement with atomistic Landau-Lifshitz-Gilbert (LLG) spin dynamics simulations. By extending our study to realistic CrSBr (CSB) nanotubes, we model a bound state of two interacting DWs arising from a balance between long-range dipolar attraction and short-range exchange repulsion. Micromagnetic simulations reveal a non-monotonic evolution of the inter-wall distance with the tube perimeter. These findings highlight vdW magnetic nanotubes as robust platforms for stable domain confinement in quasi-one-dimensional spintronic architectures.
发表机构
- Universidad de Oviedo（奥维耶多大学）
- Centro de Investigación en Nanomateriales y Nanotecnología, Universidad de Oviedo-CSIC（奥维耶多大学-西班牙国家研究委员会纳米材料与纳米技术研究中心）
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