Charanpreet Singh, Sk Jamaluddin, Subhadip Pradhan, Ashis K. Nandy, Masashi Tokunaga, Maxim Avdeev, Ajaya K. Nayak
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引用次数: 0
摘要
由于卡戈米晶格中的几何挫折,Mn3Sn 显示出 120° 的面内三角形反铁磁秩序,这是海森堡模型中交换相互作用的一种表现形式。在这里,我们展示了在电子掺杂的 Mn3Sn 样品中通过高阶交换相互作用稳定形成的可调非共面磁基态。我们的密度泛函理论计算显示,高阶交换诱导了锰矩的部分平面外排列,从而形成了倾斜的磁态,中子衍射研究以及 60 T 磁场和霍尔电阻率测量进一步证实了这一点。有趣的是,我们发现大量标量自旋手性诱导的霍尔信号取决于锰矩的非共面性程度。此外,我们还展示了同时操纵系统中的双分量阶次参数,其中两个霍尔信号可以独立操纵。本研究探讨了与多种磁序共存相关的量子现象及其在自旋电子器件中的应用前景。
Higher order exchange driven noncoplanar magnetic state and large anomalous Hall effects in electron doped kagome magnet Mn3Sn
Owing to geometrical frustration in the kagome lattice, Mn3Sn displays a 120° in-plane triangular antiferromagnetic order, a manifestation of exchange interaction within the Heisenberg model. Here, we show the formation of a tunable noncoplanar magnetic ground state stabilized by higher-order exchange interactions in electron-doped Mn3Sn samples. Our density Functional Theory calculations reveal that the higher-order exchange induces a partial out-of-plane alignment of the Mn moments, resulting in a canted magnetic state, further experimentally confirmed by neutron diffraction study along with 60 T magnetic and Hall resistivity measurements. Interestingly, we find a large scalar spin chirality-induced Hall signal depending on the degree of non-coplanarity of the Mn moments. Additionally, we demonstrate simultaneous manipulation of two-component order-parameter in the system, where the two Hall signals can be independently manipulated. The present study explores the quantum phenomena associated with the coexistence of multiple magnetic orders and their prospective use in spintronic devices.
期刊介绍:
npj Quantum Materials is an open access journal that publishes works that significantly advance the understanding of quantum materials, including their fundamental properties, fabrication and applications.