A Van der Waals Interface Hosting Two Groups of Magnetic Skyrmions
A Van der Waals Interface Hosting Two Groups of Magnetic Skyrmions
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DOI：
10.1002/adma.202110583
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发表时间：
2021-12
影响因子：
29.4
通讯作者：
Yingying Wu;Brian A. Francisco;Zhijie Chen;Wei Wang;Yu Zhang;C. Wan;Xiufeng Han;H. Chi;Yasen Hou;A. Lodesani;G. Yin;Kai Liu;Yong-Tao Cui;Kang Wang;J. Moodera
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文献类型：
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作者：
Yingying Wu;Brian A. Francisco;Zhijie Chen;Wei Wang;Yu Zhang;C. Wan;Xiufeng Han;H. Chi;Yasen Hou;A. Lodesani;G. Yin;Kai Liu;Yong-Tao Cui;Kang Wang;J. Moodera
多个磁性skyrmion相为基于skyrmion的磁密度自旋存储器件增加了额外的自由度。将场扩展到2D货车德瓦尔斯磁体是一个有益的挑战，其中可实现的自由度（例如，厚度、扭转角和电选通）和高Skyrmion密度导致了有趣的新性质和增强的功能性。在这项工作中，一个货车德瓦耳斯界面，形成两个二维铁磁体Cr2Ge2Te6和Fe3GeTe2的居里温度分别为1065和10205 K，托管两组磁skyrmions，报告。当Cr2Ge2Te6是磁有序的时，在6s 0K以下观察到两组拓扑霍尔效应信号。这两组skyrmions直接使用磁力显微镜成像，并支持微磁模拟。有趣的是，磁性skyrmion坚持在异质结构与零外加磁场。这一结果对基于货车德瓦耳斯异质结构的多相Skyrmion器件的实现具有重要意义。
Multiple magnetic skyrmion phases add an additional degree of freedom for skyrmion‐based ultrahigh‐density spin memory devices. Extending the field to 2D van der Waals magnets is a rewarding challenge, where the realizable degree of freedoms (e.g., thickness, twist angle, and electrical gating) and high skyrmion density result in intriguing new properties and enhanced functionality. In this work, a van der Waals interface, formed by two 2D ferromagnets Cr2Ge2Te6 and Fe3GeTe2 with a Curie temperature of ≈65 and ≈205 K, respectively, hosting two groups of magnetic skyrmions, is reported. Two sets of topological Hall effect signals are observed below 6s0 K when Cr2Ge2Te6 is magnetically ordered. These two groups of skyrmions are directly imaged using magnetic force microscopy, and supported by micromagnetic simulations. Interestingly, the magnetic skyrmions persist in the heterostructure with zero applied magnetic field. The results are promising for the realization of skyrmionic devices based on van der Waals heterostructures hosting multiple skyrmion phases.