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arXiv 2501.07019cond-mat.mtrl-scicond-mat.mes-hallcond-mat.str-el
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非共面磁性异质结中的大反常霍尔效应

Large Anomalous Hall Effect in a Noncoplanar Magnetic Heterostructure

Anke Song, Jine Zhang, Yequan Chen, Zhizhong Zhang, Xinjuan Cheng, Ruijie Xu, Wenzhuo Zhuang, Wenxuan Sun, Yong Zhang, Xu Zhang, Zhongqiang Chen, Fengqi Song, Y… 展开作者

Anke Song, Jine Zhang, Yequan Chen, Zhizhong Zhang, Xinjuan Cheng, Ruijie Xu, Wenzhuo Zhuang, Wenxuan Sun, Yong Zhang, Xu Zhang, Zhongqiang Chen, Fengqi Song, Yue Zhang, Xuechao Zhai, Yongbing Xu, Weisheng Zhao, Rong Zhang, Xuefeng Wang

AI总结:

本研究在Cr5Te6/Pt非共面磁性异质结中实现了创纪录的大本征反常霍尔效应,揭示其源于界面拓扑自旋织构与贝里曲率重构,为拓扑自旋电子器件应用提供了新方向。

摘要:

反常霍尔效应(AHE)存在于磁性系统中,且通过异质界面相互作用,在与磁性绝缘体相邻的非磁性材料中也会意外出现。然而,由磁近邻效应诱导的异质结中的AHE仍然相当微弱,限制了其实际器件应用。在此,我们报道了在Cr5Te6/Pt非共面磁性异质结中,5 K温度下电阻率为114 nΩ cm的大本征AHE,这是所有磁性绝缘体/重金属异质结中有记录以来的最高AHE值。AHE信号会发生反转,这是由费米能级处的贝里曲率重构导致的,第一性原理计算证实了这一点。界面处的拓扑自旋织构通过高磁场磁力显微镜被直接观测到,原子模拟证实,正是这种织构导致了大AHE的产生。这些发现为探索异质界面中的大AHE开辟了新途径,并推动了其在拓扑自旋电子器件中的潜在应用。

英文摘要:

The anomalous Hall effect (AHE) occurs in magnetic systems and also unexpectedly in non-magnetic materials adjacent to magnetic insulators via the heterointerface interactions. However, the AHE in heterostructures induced by magnetic proximity effect remains quite weak, restricting their practical device applications. Here, we report a large intrinsic AHE with a resistivity of 114 nΩ cm at 5 K in noncoplanar magnetic heterostructures of Cr5Te6/Pt. This is the record-high AHE value among all the magnetic insulators/heavy metal heterostructures. A reversal of the AHE signal occurs due to the reconstruction of Berry curvature at the Fermi level, which is verified by the first-principles calculations. Topological spin textures at the interface are directly visualized via high-magnetic-field magnetic force microscopy, which accounts for the large AHE, as confirmed by the atomic simulations. These findings open a new avenue for exploring the large AHE in heterointerfaces and facilitate the potential applications in topological spintronic devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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