# Thickness dependence of the anomalous Hall effect in thin films of the topological semimetal Co$_2$MnGa

## TL;DR

This study investigates how the thickness of Co$_2$MnGa thin films influences the anomalous Hall effect, revealing intrinsic topological properties and potential for spintronic applications.

## Contribution

It provides a systematic analysis of the structural and magnetotransport properties of Co$_2$MnGa films across different thicknesses, linking topological features to transport phenomena.

## Key findings

- Maximum anomalous Hall conductivity of 1138 S/cm
- Anomalous Hall angle of 13% in the films
- Good agreement between theory and experiment for 80 nm film

## Abstract

Topological magnetic semimetals promise large Berry curvature through the distribution of the topological Weyl nodes or nodal lines and further novel physics with exotic transport phenomena. We present a systematic study of the structural and magnetotransport properties of Co$_2$MnGa films from thin (20 nm) to bulk like behavior (80 nm), in order to understand the underlying mechanisms and the role on the topology. The magnetron sputtered Co$_2$MnGa films are $L$$2_{\mathrm {1}}$-ordered showing very good heteroepitaxy and a strain-induced tetragonal distortion. The anomalous Hall conductivity was found to be maximum at a value of 1138 S/cm, with a corresponding anomalous Hall angle of 13 %, which is comparatively larger than topologically trivial metals. There is a good agreement between the theoretical calculations and the Hall conductivity observed for the 80 nm film, which suggest that the effect is intrinsic. Thus, the Co$_2$MnGa compound manifests as a promising material towards topologically-driven spintronic applications.