Room-temperature terahertz anomalous Hall effect in Weyl antiferromagnet Mn3Sn thin films
Room-temperature terahertz anomalous Hall effect in Weyl antiferromagnet Mn3Sn thin films
复制标题
DOI：
10.1038/s41467-020-14690-6
复制
发表时间：
2020-02-14
影响因子：
16.6
通讯作者：
Matsunaga, Ryusuke
中科院分区：
文献类型：
--
作者：
Matsuda, Takuya;Kanda, Natsuki;Matsunaga, Ryusuke
太赫兹（THz）频率的反铁磁自旋运动引起了快速自旋电子学越来越多的兴趣，然而，它们对外部场的较小响应抑制了器件的应用。近年来，Weyl半金属候选材料非共线反铁磁体Mn3Sn在室温下表现出与铁磁体相当的巨大反常霍尔效应（AHE）。如此大响应的动力学方面是未来太赫兹数据处理需要澄清的重要问题。本文采用极化分辨光谱法研究了Mn3Sn薄膜的太赫兹异常霍尔电导率。大的异常霍尔电导率Re σ (xy)（ω）类似于20 ω (-1)cm（-1）在太赫兹频率被清楚地观察到极化旋转。讨论了自旋织构中对称性的破缺/恢复所对应的特殊温度依赖性。室温下的太赫兹AHE观测证明了Mn3Sn反铁磁自旋电子学的超快读出，也将为研究Weyl反铁磁体的非平衡动力学开辟新的途径。
Antiferromagnetic spin motion at terahertz (THz) frequencies attracts growing interests for fast spintronics, however, their smaller responses to external field inhibit device application. Recently the noncollinear antiferromagnet Mn3Sn, a Weyl semimetal candidate, was reported to show large anomalous Hall effect (AHE) at room temperature comparable to ferromagnets. Dynamical aspect of such large responses is an important issue to be clarified for future THz data processing. Here the THz anomalous Hall conductivity in Mn3Sn thin films is investigated by polarization-resolved spectroscopy. Large anomalous Hall conductivity Re sigma(xy)(omega) similar to 20 Omega(-1)cm(-1) at THz frequencies is clearly observed as polarization rotation. A peculiar temperature dependence corresponding to the breaking/recovery of symmetry in the spin texture is also discussed. Observation of the THz AHE at room temperature demonstrates the ultrafast readout for the antiferromagnetic spintronics using Mn3Sn, and will also open new avenue for studying nonequilibrium dynamics in Weyl antiferromagnets.