Room-temperature terahertz anomalous Hall effect in Weyl antiferromagnet Mn3Sn thin films

Takuya Matsuda, Natsuki Kanda, Tomoya Higo, N. P. Armitage, Satoru Nakatsuji and Ryusuke Matsunaga ()
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Takuya Matsuda: The University of Tokyo
Natsuki Kanda: The University of Tokyo
Tomoya Higo: The University of Tokyo
N. P. Armitage: The Johns Hopkins University
Satoru Nakatsuji: The University of Tokyo
Ryusuke Matsunaga: The University of Tokyo

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract 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 $${\mathrm{Re}}\;\sigma _{xy}\left( \omega \right) \sim 20\;{\mathrm{\Omega }}^{ - 1}{\mathrm{cm}}^{ - 1}$$Reσxyω~20Ω−1cm−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.

Date: 2020
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DOI: 10.1038/s41467-020-14690-6

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