Magnetic skyrmion manipulation in CrTe2/WTe2 2D van der Waals heterostructure

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2022-05-02 DOI:10.1063/5.0089999

S. Fragkos, P. Pappas, Evgenia Symeonidou, Y. Panayiotatos, A. Dimoulas

引用次数: 7

Abstract

Magnetic skyrmions in two-dimensional van der Waals materials provide an ideal platform to push skyrmion technology to the ultimate atomically thin limit. In this work, we theoretically demonstrate the Dzyaloshinskii–Moriya interaction and the formation of a Néel-type skyrmion lattice at the CrTe2/WTe2 bilayer van der Waals heterostructure. Our calculations suggest a field-controlled Néel-type skyrmion lattice—a ferromagnet transition cycle. In addition, a spin-torque induced by spin-polarized current injection was simulated in order to study the motion of a skyrmion on a racetrack, where an increase in the skyrmion Hall angle is observed at high temperatures. Consequently, this study suggests that generation and annihilation of skyrmions can be achieved with temperature or field control and also manipulate the velocity and the direction of the Néel-type skyrmions through ultra-low current densities and temperature, thus shedding light on the general picture of magnetic skyrmion control and design of two-dimensional van der Waals heterostructures.

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CrTe2/WTe2二维范德华异质结构的磁skyrmion操纵

二维范德华材料中的磁性skyrmion提供了一个理想的平台，将skyrmion技术推向原子薄的极限。在这项工作中，我们从理论上证明了Dzyaloshinskii–Moriya相互作用和在CrTe2/WTe2双层范德华异质结构上Néel型skyrmion晶格的形成。我们的计算表明，场控制的Néel型skyrmion晶格是一种铁磁体跃迁循环。此外，为了研究skyrmion在赛道上的运动，模拟了由自旋极化电流注入引起的自旋转矩，在高温下可以观察到skyrmion霍尔角的增加。因此，这项研究表明，skyrmion的产生和湮灭可以通过温度或场控制来实现，还可以通过超低的电流密度和温度来操纵Néel型skyrmions的速度和方向，从而揭示磁性skyrmion控制和二维范德华异质结构设计的全貌。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.