界面诱导的非平凡拓扑自旋织构的稳定性:揭示室温hopons和Skyrmions。

IF 26.8 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Ferhat Katmis, Valeria Lauter, Rawana Yagan, Iuri S Brandt, Arash M Cheghabouri, Hua Zhou, John W Freeland, Clodoaldo I L de Araujo, Michelle E Jamer, Don Heiman, Mehmet C Onbasli, Jagadeesh S Moodera
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引用次数: 0

摘要

拓扑自旋构型,如类孤子自旋织构和狄拉克电子组装,最近出现在基础科学和技术中。在室温下获得稳定的拓扑自旋织构对于它们作为远程信息载体的使用至关重要。然而,它们的创建和操作受到多步骤领域训练和竞争互动的阻碍。因此,多维拓扑自旋纹理的自发基态是可取的,skyrmions在二维中形成旋转的,像刺猬一样的自旋结构,hopons作为它们的扭曲三维对应物。本文首次在室温和零磁场条件下观察到hopfions和skyrmions的鲁棒性和可重复性拓扑自旋织构,这些织构在铁磁体/拓扑绝缘体/铁磁体三层异质结构中由几何约束稳定并由界面磁性保护。用洛伦兹透射电子显微镜在室温下直接观察到这些天幕-跳跃构型。利用微磁模型,再现了hopion -skyrmion组合的实验观测结果。该模型揭示了由跳跃环包围的自发组织的skyrmion晶格是如何由表面电子、单轴各向异性和Dzyaloshinskii-Moriya相互作用控制的完整图景。本研究证明了拓扑手性自旋织构可以促进磁性拓扑载流子的发展,为超低功耗和高密度信息处理铺平了道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Interface-Induced Stability of Nontrivial Topological Spin Textures: Unveiling Room-Temperature Hopfions and Skyrmions.

Topological spin configurations, such as soliton-like spin texture and Dirac electron assemblies, have recently emerged in fundamental science and technology. Achieving stable topological spin textures at room temperature is crucial for their use as long-range information carriers. However, their creation and manipulation are hindered by multi-step field training and competing interactions. Thus, a spontaneous ground state for multidimensional topological spin textures is desirable, with skyrmions forming swirling, hedgehog-like spin structures in two dimensions and hopfions as their twisted 3D counterparts. Here, the first observation of robust and reproducible topological spin textures of hopfions and skyrmions observed at room temperature and in zero magnetic field is reported, which are stabilized by geometric confinement and protected by interfacial magnetism in a ferromagnet/topological insulator/ferromagnet trilayer heterostructure. These skyrmion-hopfion configurations are directly observed at room temperature with Lorenz transmission electron microscopy. Using micromagnetic modeling, the experimental observations of hopfion-skyrmion assemblies are reproduced. This model reveals a complete picture of how spontaneously organized skyrmion lattices encircled by hopfion rings are controlled by surface electrons, uniaxial anisotropy, and Dzyaloshinskii-Moriya interaction. This study provides evidence that topological chiral spin textures can facilitate the development of magnetic topological carriers, paving the way for ultralow-power and high-density information processing.

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来源期刊
Advanced Materials
Advanced Materials 工程技术-材料科学:综合
CiteScore
43.00
自引率
4.10%
发文量
2182
审稿时长
2 months
期刊介绍: Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.
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