Topological Hall Effect in Traditional Ferromagnet Embedded with Black-Phosphorus-Like Bismuth Nanosheets
Topological Hall Effect in Traditional Ferromagnet Embedded with Black-Phosphorus-Like Bismuth Nanosheets
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嵌入类黑磷铋纳米片的传统铁磁体的拓扑霍尔效应
DOI：
10.1021/acsami.0c04447
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发表时间：
2020
影响因子：
9.5
通讯作者：
He Hongtao
中科院分区：
文献类型：
--
作者：
Zhou Liang;Chen Junshu;Chen Xiaobin;Xi Bin;Qiu Yang;Zhang Junwei;Wang Linjing;Zhang Runnan;Ye Bicong;Chen Pingbo;Zhang Xixiang;Guo Guoping;Yu Dapeng;Mei Jia-Wei;Ye Fei;Wang Gan;He Hongtao
拓扑霍尔效应是由手性磁性织构的标量自旋手性引起的反常霍尔响应。到目前为止，这种效应只在某些特殊材料中观察到，而在传统的铁磁体中很少观察到。在这项工作中，我们实现了分子束外延技术，成功地将具有强烈自旋轨道耦合的黑磷类铋纳米片嵌入到碲化铬Cr2Te3的块体中，原子分辨X射线能谱图谱证明了这一点。与原始的Cr2Te3不同，这些嵌铋的Cr2Te3外延薄膜不仅表现出明显的拓扑霍尔效应，而且还表现出磁阻反常和差磁化率平台。所有这些实验特征都表明在掺铋的Cr2Te3中可能出现了磁天子，这进一步得到了我们用第一原理计算得到的所有输入参数的数值模拟的支持。因此，我们的工作展示了一种在铁磁体中诱导Skyrmion的新的有效方法，以及通过嵌入具有强自旋轨道耦合的纳米片来实现拓扑霍尔效应。
Topological Hall effect is an abnormal Hall response arising from the scalar spin chirality of chiral magnetic textures. Up to now, such an effect is only observed in certain special materials, but rarely in traditional ferromagnets. In this work, we have implemented the molecular beam epitaxy technique to successfully embed black-phosphorus-like bismuth nanosheets with strong spin-orbit coupling into the bulk of chromium telluride Cr2Te3, as evidenced by atomically resolved energy dispersive X-ray spectroscopy mapping. Distinctive from pristine Cr2Te3, these Bi-embedded Cr2Te3epitaxial films exhibit not only pronounced topological Hall effects, but also magnetoresistivity anomalies and differential magnetic susceptibility plateaus. All these experimental features point to the possible emergence of magnetic skyrmions in Bi-embedded Cr2Te3, which is further supported by our numerical simulations with all input parameters obtained from the first-principle calculations. Therefore, our work demonstrates a new efficient way to induce skyrmions in ferromagnets, as well as the topological Hall effect by embedding nanosheets with strong spin–orbit couplings.