Mesoscopic Hall effect driven by chiral spin order

TL;DR

This paper predicts a mesoscopic Hall effect driven by spin chirality in a vortex domain wall system, showing transverse voltage and spin current generation without relying on spin-orbit interaction.

Contribution

It introduces a novel mesoscopic Hall effect mechanism based on spin chirality near vortex domain walls, beyond the adiabatic approximation.

Findings

Hall voltage and spin current are generated transversely.

The effect resembles the conventional spin Hall effect.

Results are relevant when Fermi energy is comparable to exchange energy.

Abstract

A Hall effect due to spin chirality in mesoscopic systems is predicted. We consider a 4-terminal Hall system including local spins with geometry of a vortex domain wall, where strong spin chirality appears near the center of vortex. The Fermi energy of the conduction electrons is assumed to be comparable to the exchange coupling energy where the adiabatic approximation ceases to be valid. Our results show a Hall effect where a voltage drop and a spin current arise in the transverse direction. The similarity between this Hall effect and the conventional spin Hall effect in systems with spin-orbit interaction is pointed out.