Room-temperature terahertz anomalous Hall effect in Weyl antiferromagnet Mn<sub>3</sub>Sn thin films
Room-temperature terahertz anomalous Hall effect in Weyl antiferromagnet Mn<sub>3</sub>Sn thin films
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Weyl反铁磁体Mn<sub>3</sub>Sn薄膜中的室温太赫兹反常霍尔效应
DOI：
10.11470/oubutsu.90.12_752
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
松永 隆佑
中科院分区：
文献类型：
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作者：
松田 拓也;肥後 友也;神田 夏輝;松永 隆佑
[en]反铁磁体是实现超快自旋电子器件的理想材料，因为它们的自旋进动运动可以在太赫兹频率下驱动。但由于净磁化强度极小，反铁磁自旋序的读出是困难的。非共线Weyl反铁磁金属Mn3Sn在室温下可果美双层膜上由于自旋多极子的时间反演对称性破缺而表现出与铁磁体相当的反常霍尔效应。我们报告的太赫兹反常霍尔效应的观察，在高品质的Mn3Sn薄膜的偏振分辨太赫兹光谱，发现非耗散的大的反常霍尔电流出现高达约1太赫兹。我们对大响应的观察为超快太赫兹反铁磁性读出铺平了道路。（作者）
[en] Antiferromagnets are promising materials for realizing ultrafast spintronic devices because their spin precession motions can be driven at terahertz frequencies. But the readout of the antiferromagnetic spin order is difficult due to the vanishingly-small net magnetization. A noncollinear Weyl antiferromagnetic metal Mn 3 Sn shows a large anomalous Hall effect comparable to ferromagnets owing to broken time-reversal symmetry by the cluster spin multipole on the Kagome bilayer at room temperature. We report on observations of the terahertz anomalous Hall effect in high-quality Mn 3 Sn thin films by polarization-resolved terahertz spectroscopy and found that the nondissipative large anomalous Hall currents appear up to approximately 1 THz. Our observation of the large response paves the way for ultrafast terahertz readout of antiferromagnetism.(author)