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arXiv 2310.16680cond-mat.mes-hallphysics.app-ph
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通过阶梯型 DMI 方法操控混合型斯格明子动力学

Manipulation of hybrid skyrmion dynamics by step DMI approach

Hitesh Chhabra, Jayaseelan Dhakshinamoorthy, Ajaya K. Nayak

AI总结:

本研究提出一种阶梯型 DMI 工程方法,通过微磁学模拟在混合型斯格明子 racetrack 中精确控制斯格明子尺寸与速度,并找到临界 DMI 比率消除斯格明子霍尔效应,实现无 SkHE 的高速稳定斯格明子。

摘要:

拓扑保护的磁性斯格明子中非共线原子自旋排列的动态行为,在未来潜在的自旋电子学技术中扮演关键角色,包括基于 racetrack memory 的超高密度存储器件。然而,斯格明子的拓扑特性会带来不受欢迎的斯格明子霍尔效应(SkHE),这对实际应用构成了重大挑战。在此,我们提出了一项详细的微磁学模拟研究,通过在混合型斯格明子 racetrack 中对 Dzyaloshinskii-Moriya interaction (DMI) 进行精细工程化处理,深入探讨了斯格明子动力学的受控操控。具体而言,我们引入了体 DMI 和界面 DMI 的梯度变化,使得斯格明子霍尔角(SkHA)呈现抛物线轨迹,从而让我们能够找到一个 SkHE 几乎为零的临界 DMI 比率。最重要的是,我们提出了一种新方法,通过对 racetrack 进行工程化设计,策略性地放置阶梯型 DMI 区域,从而对混合型斯格明子的尺寸和速度进行精细控制。本研究为实现无 SkHE 的稳定斯格明子以及通过优化的 DMI 工程提高斯格明子速度,提供了新的方向。

英文摘要:

The dynamic behavior of non-collinear atomic spin arrangements in a topologically protected magnetic skyrmion plays a pivotal role in potential future spintronic technologies, including racetrack memory based ultra-high-density storage devices. However, the topological nature of the skyrmion comes with an unwanted skyrmion Hall effect (SkHE) that poses a significant challenge in the practical application. Here we present a detailed micromagnetic simulation study that delves into the controlled manipulation of skyrmion dynamics through a subtle engineering of Dzyaloshinskii-Moriya interaction (DMI) in a hybrid skyrmion racetrack. In particular, we introduce a gradient variation of bulk and interfacial DMI that results into a parabolic trajectory of Skyrmion Hall angle (SkHA), thereby allowing us to find a critical DMI ratio with almost zero SkHE. Most importantly, we present a novel approach involving engineering of a racetrack with strategically placed step DMI regions that gives us a meticulous control over the size and speed of the hybrid skyrmions. The present study gives a new direction for the simultaneous realization of stable skyrmions without SkHE and increased skyrmion speed with optimized DMI engineering.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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