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

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

Kondo physics in antiferromagnetic Weyl semimetal Mn 3+ x Sn 1− x films

“…The metallic sample ( x = 0.13) shows a small Faraday rotation on the order of a few milliradians ( Fig. 4A ), which is similar to the observed value in a recent study on polycrystalline Mn 3 Sn films ( 40 ). In sharp contrast, for the gapped sample ( x = 0.47), the imaginary part of the Faraday rotation, which is related to the ellipticity ( ; Fig.…”

“…4A ). We applied 6 T to align the magnetic domain first and then performed the Faraday rotation measurement by reducing the field from 4 to 0 T. The resonance-enhanced is 0.3 rad at 4 T, which is around 40 times larger than that in the recent study on metallic Mn 3 Sn films ( 40 ). The gap-induced resonance feature in optical rotations was also recently observed in a magnetic topological insulator ( 41 ).…”

Ultrafast electron transport in metallic antiferromagnetic Mn2Au thin films probed by terahertz spectroscopy

“…τ = 50.1 ± 2.8, 23.9 ± 2.8.8, and 16.6 ± 3.4 fs for 15, 10, and 5 nm samples, respectively. The values are very similar to the values obtained from both ferromagnetic iron thin films [28] and antiferromagnet Mn 3 Sn thin films [29]. In addition, Fig.…”

Anomalous transport due to Weyl fermions in the chiral antiferromagnets Mn3X, X = Sn, Ge

“…Kagome-based metals have recently become a new focus in the field of quantum materials for their topological electronic structures, as well as large electromagnetic and transport responses 4 – 6 , 9 , 11 , 12 , 15 , 23 , 30 , 31 . Mn 3 Sn and Mn 3 Ge are hexagonal chiral antiferromagnets (space group P6 3 / mmc ) that comprise breathing-type kagome layers of Mn atoms in the ab -plane (Fig.…”