Spontaneous topological Hall effect induced by non-coplanar antiferromagnetic order in intercalated van der Waals materials
Spontaneous topological Hall effect induced by non-coplanar antiferromagnetic order in intercalated van der Waals materials
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DOI：
10.1038/s41567-023-02017-3
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发表时间：
2023-03
期刊：
影响因子：
19.6
通讯作者：
H. Takagi;R. Takagi;S. Minami;T. Nomoto;K. Ohishi;M.-T. Suzuki;Y. Yanagi;M. Hirayama;N. Khanh;K. Karube;H. Saito;D. Hashizume;R. Kiyanagi;Y. Tokura;R. Arita;T. Nakajima;S. Seki
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作者：
H. Takagi;R. Takagi;S. Minami;T. Nomoto;K. Ohishi;M.-T. Suzuki;Y. Yanagi;M. Hirayama;N. Khanh;K. Karube;H. Saito;D. Hashizume;R. Kiyanagi;Y. Tokura;R. Arita;T. Nakajima;S. Seki
在铁磁体中，电流通常感应出与内部磁化成比例的横向霍尔电压。这种效应经常用于自旋↑和自旋↓态的电读出。虽然这些性质通常不会在反铁磁体中出现，但最近的理论研究预测，具有有限标量自旋手性的非共面反铁磁有序-意味着相邻自旋跨越的立体角-即使没有净磁化或外部磁场也可以诱导大的自发霍尔效应。这种现象-自发拓扑霍尔效应-可以潜在地用于反铁磁状态的有效电读出，但由于缺乏合适的材料托管这种磁性，它还没有得到实验验证。本文报道了在三角晶格化合物CoTa 3S 6和CoNb 3S 6中发现的全进全出型非共面反铁磁有序.据报道，这些化合物的主机非常规的大自发霍尔效应，尽管他们消失的小净磁化，我们的分析表明，它可以解释的拓扑霍尔效应，起源于与标量自旋手性相关的虚拟磁场。这些结果表明，标量自旋手性机制提供了一个有前途的路线，实现一个巨大的自发霍尔响应，即使在补偿反铁磁体，并强调插入货车德瓦尔斯磁铁作为一个有前途的准二维材料平台，使各种非平凡的方式的电阅读和可能的写入非共面反铁磁畴。
In ferromagnets, an electric current generally induces a transverse Hall voltage in proportion to the internal magnetization. This effect is frequently used for the electrical readout of the spin-↑ and spin-↓ states. Although these properties are usually not expected in antiferromagnets, recent theoretical studies predicted that a non-coplanar antiferromagnetic order with finite scalar spin chirality—meaning a solid angle spanned by neighbouring spins—can induce a large spontaneous Hall effect even without a net magnetization or external magnetic field. This phenomenon—the spontaneous topological Hall effect—can potentially be used for the efficient electrical readout of antiferromagnetic states, but it has not been experimentally verified due to a lack of appropriate materials hosting such magnetism. Here we report the discovery of an all-in–all-out-type non-coplanar antiferromagnetic order in triangular lattice compounds CoTa3S6and CoNb3S6. These compounds are reported to host unconventionally large spontaneous Hall effects despite their vanishingly small net magnetization, and our analysis reveals that it can be explained in terms of the topological Hall effect that originates from the fictitious magnetic field associated with scalar spin chirality. These results indicate that the scalar spin chirality mechanism offers a promising route to the realization of a giant spontaneous Hall response even in compensated antiferromagnets, and highlight intercalated van der Waals magnets as a promising quasi-two-dimensional material platform to enable various non-trivial ways of electrical reading and the possible writing of non-coplanar antiferromagnetic domains.