Elongated antiferromagnetic skyrmion in two-dimensional RuF4

IF 6.8 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science China Materials Pub Date : 2024-08-20 DOI:10.1007/s40843-024-3020-y

Mu Lan (, ), Rong Wang (, ), Shihao Wei (, ), Lezhong Li (, ), Wenning Ren (, ), Xing Zhang (, ), Xi Zhang (, ), Gang Xiang (, )

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引用次数: 0

Abstract

Two-dimensional (2D) antiferromagnetic (AFM) skyrmions are free from stray magnetic field and skyrmion Hall effect, and can be driven by a small current density up to a high speed, desirable for low-power spintronic applications. However, most 2D AFM skyrmions are realized in complex heterostructured materials, which impedes the dense integration of spintronic devices. Here, we propose that 2D AFM skyrmions can be achieved in ruthenium tetrafluoride (RuF₄) monolayer using hybrid functional theory combined with atomistic spin dynamics simulations. Our study indicates that 2D RuF₄ is dynamically stable and its nondegenerate vibration modes in optical branches are either Raman or infrared active. Furthermore, 2D RuF₄ acts as an indirect bandgap semiconductor with an out-of-plane AFM state. Notably, the presence of a weak Dzyaloshinskii-Moriya interaction in 2D RuF₄ leads to a spin spiral ground state at low temperatures, enabling the formation of AFM skyrmions with possible length modulation by an external magnetic field. Our results give insight into 2D RuF₄ and may provide an intriguing platform for 2D AFM skyrmion-based spintronic applications.

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二维 RuF4 中的拉长反铁磁天线

二维（2D）反铁磁性（AFM）天线离子不受杂散磁场和天线霍尔效应的影响，可以通过较小的电流密度实现高速驱动，是低功耗自旋电子应用的理想之选。然而，大多数二维 AFM 天幕都是在复杂的异质结构材料中实现的，这阻碍了自旋电子器件的密集集成。在这里，我们利用混合函数理论结合原子自旋动力学模拟，提出了在四氟化钌（RuF4）单层中实现二维原子力显微镜天幕的方法。我们的研究表明，二维 RuF4 具有动态稳定性，其光学分支中的非enerate 振动模式具有拉曼或红外活性。此外，二维 RuF4 还是一种具有平面外 AFM 状态的间接带隙半导体。值得注意的是，二维 RuF4 中存在微弱的 Dzyaloshinskii-Moriya 相互作用，这导致了低温下的自旋螺旋基态，从而形成了可通过外部磁场进行长度调制的 AFM 天线。我们的研究结果使人们对二维 RuF4 有了深入的了解，并可能为基于二维 AFM 天线的自旋电子应用提供一个有趣的平台。

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.