Observation of large intrinsic anomalous Hall conductivity in polycrystalline Mn$_3$Sn films

TL;DR

This study reports the observation of a large intrinsic anomalous Hall conductivity in polycrystalline Mn$_3$Sn films, revealing significant Hall effects and magnetic properties at low temperatures, with potential implications for spintronic applications.

Contribution

First demonstration of large intrinsic anomalous Hall conductivity in polycrystalline Mn$_3$Sn thin films, expanding understanding of Hall effects in this material system.

Findings

Large anomalous Hall conductivity of 65 (Ωcm)$^{-1}$ at 3K.

Weak ferromagnetic moment with small hysteresis.

Negative magnetoresistance observed across temperatures.

Abstract

We report the observation of anomalous Hall effect in Mn$_3$Sn polycrystalline thin films deposited on Pt coated Al$_2$O$_3$ substrate with a large anomalous Hall conductivity of 65($\Omega$cm)$^{-1}$ at 3K. The Hall and magnetic measurements show a very small hysteresis owing to a weak ferromagnetic moment in this material. The longitudinal resistivity decreases sufficiently for the thin films as compared to the polycrystalline bulk sample used as the target for the film deposition. The anomalous Hall resistivity and conductivity decreases almost linearly with the increase in the temperature. A negative magnetoresistance is observed for all the measured temperatures with the negative decrease in the magnitude with the increase in temperature.