Complex magnetic ordering and associated topological Hall effect in a two-dimensional metallic chiral magnet

TL;DR

This paper investigates the complex magnetic phases and topological Hall effect in a two-dimensional metallic chiral magnet, revealing the microscopic mechanisms behind skyrmion formation and unconventional magneto-transport phenomena.

Contribution

It introduces a minimal model coupling itinerant electrons with local moments, elucidating the magnetic phases and transport properties under strong magneto-electric coupling.

Findings

Identification of multiple field-induced magnetic phases

Explanation of the microscopic origin of the topological Hall effect

Insights into unconventional magneto-transport in metallic chiral magnets

Abstract

Motivated by recent experiments on the observation of room temperature skyrmions in a layered heterostructure and subsequent demonstration of topological Hall effect in the same system, we have studied a minimal model of itinerant electrons coupled to local moments with competing interactions in an external magnetic field. Working in the limit of strong magneto-electric coupling where the fast dynamics of the electrons can be decoupled from the slow dynamics of the local moments (treated as classical spins), we analyze the multiple field induced magnetic phases and the associated electronic transport properties in these regimes. Our results help understand the microscopic origin of the observed phenomena and further provide crucial insight into unconventional magneto-transport in metallic chiral magnets.