发表机构
University of Electronic Science and Technology of China（电子科技大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究证明反斯格明子可作为磁四极透镜聚焦或散焦电流，通过自洽量子输运与微磁模拟揭示高度各向异性的四极霍尔效应，电流聚焦显著提升反斯格明子速度并减小霍尔角，为反斯格明子赛道存储器和自旋电子器件提供了新机制。
AI 中文摘要
我们证明了反斯格明子可以作为磁四极透镜，对穿过它们的电流进行聚焦或散焦。我们展示了反斯格明子核心作为焦点，电子束在特定注入方向下汇聚于此，导致各向异性且不均匀的电流分布。因此，通过自旋转移力矩，磁四极透镜效应深刻改变了电流诱导的反斯格明子动力学。通过将量子输运和微磁模拟迭代结合，我们自洽地捕捉了传导电子与反斯格明子的耦合动力学。我们的结果揭示了一种高度各向异性的四极反斯格明子霍尔效应，该效应相对于电流方向具有显著的方向依赖性，并可通过自旋轨道耦合进行调控。特别地，电流聚焦（散焦）显著增强（抑制）了反斯格明子的速度，同时减小了其霍尔角，从而克服了反斯格明子赛道存储器的一个关键挑战。我们的工作确立了固有电流透镜效应作为操控拓扑磁性纹理的强大机制，并为基于反斯格明子的自旋电子器件开辟了新途径。
英文摘要
We demonstrate that antiskyrmions can serve as magnetic quadrupole lenses that focus or defocus electric currents traversing them. We showcase the antiskyrmion core as a focal point where electron beams converge for specific injection directions, leading to anisotropic and nonuniform current distributions. Thus the current-induced antiskyrmion dynamics is profoundly modified by the magnetic quadrupole lensing via the spin-transfer torque. By incorporating quantum transport and micromagnetic simulations iteratively, we self-consistently capture the coupled dynamics of conduction electrons and antiskyrmions. Our results unveil a quadrupolar antiskyrmion Hall effect that is highly anisotropic with respect to the current direction and can be effectively tuned by the spin-orbit coupling. In particular, the current focusing (defocusing) dramatically enhances (suppresses) the antiskyrmion speed while simultaneously reducing its Hall angle, thereby overcoming a key challenge for antiskyrmion racetrack memories. Our work establishes the intrinsic current lensing as a powerful mechanism for manipulating topological magnetic textures and opens new avenues for antiskyrmion-based spintronic devices.
Comments6 pages, 4 figures
