Room-temperature terahertz anomalous Hall effect in Weyl antiferromagnet Mn3Sn thin films.,Nature Communications

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Room-temperature terahertz anomalous Hall effect in Weyl antiferromagnet Mn3Sn thin films.
Nature Communications ( IF 14.7 ) Pub Date : 2020-02-14 , DOI: 10.1038/s41467-020-14690-6
Takuya Matsuda ₁ , Natsuki Kanda ₁ , Tomoya Higo _{1,

2} , N P Armitage ₃ , Satoru Nakatsuji _{1,

2,

3,

4} , Ryusuke Matsunaga _{1,

5}

Affiliation

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 [Formula: see text] 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.

中文翻译：

Weyl反铁磁体Mn3Sn薄膜的室温太赫兹异常霍尔效应。

太赫兹（THz）频率的反铁磁自旋运动吸引了快速自旋电子学的兴趣，但是，它们对外部磁场的较小响应抑制了器件的应用。最近，据报道，Weyl半金属候选物非共线反铁磁体Mn3Sn在室温下显示出与铁磁体相当的大异常霍尔效应（AHE）。如此大的响应的动力学方面是未来THz数据处理中需要澄清的重要问题。在这里，通过偏振分辨光谱法研究了Mn3Sn薄膜中的太赫兹异常霍尔电导率。极化旋转清楚地观察到了太赫兹频率下的大的异常霍尔电导率（公式：见正文）。还讨论了与自旋织构中对称性的破坏/恢复相对应的特殊温度依赖性。

更新日期：2020-02-14

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