Room‐Temperature Magnetic Skyrmions and Large Topological Hall Effect in Chromium Telluride Engineered by Self‐Intercalation
Room‐Temperature Magnetic Skyrmions and Large Topological Hall Effect in Chromium Telluride Engineered by Self‐Intercalation
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DOI：
10.1002/adma.202205967
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发表时间：
2022-10
影响因子：
29.4
通讯作者：
Chen-hui Zhang;Chen Liu;Junwei Zhang;Youyou Yuan;Y. Wen;Yan Li;D. Zheng;Qiang Zhang;Z. Hou;G. Yin;Kai Liu;Yong Peng;Xixiang Zhang
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文献类型：
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作者：
Chen-hui Zhang;Chen Liu;Junwei Zhang;Youyou Yuan;Y. Wen;Yan Li;D. Zheng;Qiang Zhang;Z. Hou;G. Yin;Kai Liu;Yong Peng;Xixiang Zhang
表现出强大的拓扑霍尔效应（THE）的室温磁性skyrmion材料对于新型纳米自旋电子器件至关重要。然而，这样的Skyrmion托管材料在自然界中是罕见的。在这项研究中，报道了具有层状晶体结构的自插层过渡金属二硫属化物Cr1+xTe2，其具有室温skyrmions并表现出大的THE。通过调节自插层浓度，实现了居里温度从169到333 K的单调控制和磁各向异性从面外到面内的转变。基于嵌入工程，在Cr1.53Te2中成功地产生了居里温度为295 K且具有相对较弱的垂直磁各向异性的室温skyrmions。值得注意的是，在290 K下观察到高达106 nΩ cm的skyrmion诱导拓扑霍尔电阻率。此外，还发现在低温下THE的符号反转，这可以归因于具有与skyrmions相反的拓扑电荷的其他拓扑自旋织构。因此，碲化铬可以作为Skyrmion材料家族的一个新的范例，在未来的器件应用中具有良好的前景。
Room‐temperature magnetic skyrmion materials exhibiting robust topological Hall effect (THE) are crucial for novel nano‐spintronic devices. However, such skyrmion‐hosting materials are rare in nature. In this study, a self‐intercalated transition metal dichalcogenide Cr1+xTe2 with a layered crystal structure that hosts room‐temperature skyrmions and exhibits large THE is reported. By tuning the self‐intercalate concentration, a monotonic control of Curie temperature from 169 to 333 K and a magnetic anisotropy transition from out‐of‐plane to the in‐plane configuration are achieved. Based on the intercalation engineering, room‐temperature skyrmions are successfully created in Cr1.53Te2 with a Curie temperature of 295 K and a relatively weak perpendicular magnetic anisotropy. Remarkably, a skyrmion‐induced topological Hall resistivity as large as ≈106 nΩ cm is observed at 290 K. Moreover, a sign reversal of THE is also found at low temperatures, which can be ascribed to other topological spin textures having an opposite topological charge to that of the skyrmions. Therefore, chromium telluride can be a new paradigm of the skyrmion material family with promising prospects for future device applications.