Noncollinear antiferromagnet Mn₃Sn has attracted wide interest as it is a candidate for Weyl semimetal. Here, we report the observation of topological Hall like signals in Mn₃Sn/Pt bilayers grown on Al₂O₃(0001). X-ray diffraction and scanning transmission electron microscopy results confirm the high epitaxial quality of the c-axis-oriented Mn₃Sn films. The detected topological Hall resistivity shows a broad temperature range from 210 to 365 K by tuning the thickness of Mn₃Sn from 3 to 15 nm. Compared with previously reported topological Hall effects in Mn₃Sn at temperatures below 50 K, the observed high-temperature topological Hall signal is likely due to the stabilization of topological spin textures enabled by the strong spin–orbit coupling of the Pt overlayer and the Dzyaloshinskii–Moriya interaction at the Mn₃Sn/Pt interface.

中文翻译：

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非共线反铁磁体Mn3Sn/Pt双层中的可调拓扑霍尔效应

非共线反铁磁体 Mn ₃ Sn 引起了广泛的兴趣，因为它是外尔半金属的候选材料。在这里，我们报告了在Al ₂ O ₃（0001）上生长的Mn ₃ Sn / Pt双层中对拓扑霍尔信号的观察。X 射线衍射和扫描透射电子显微镜结果证实了c轴取向的 Mn ₃ Sn 薄膜的高外延质量。通过将 Mn ₃ Sn的厚度从 3 nm调整到 15 nm ，检测到的拓扑霍尔电阻率显示出从 210 到 365 K 的宽温度范围。与先前报道的 Mn _{3 中的}拓扑霍尔效应相比Sn 在低于 50 K 的温度下，观察到的高温拓扑霍尔信号可能是由于 Pt 覆盖层的强自旋-轨道耦合和 Mn ₃ Sn/Pt处的 Dzyaloshinskii-Moriya 相互作用使拓扑自旋纹理稳定界面。