Anomalous magnetoresistance in an antiferromagnetic Kagome semimetal heterostructures

TL;DR

This paper reports on the discovery of tunable topological spin textures and unconventional magnetoresistance oscillations in antiferromagnetic Kagome FeSn heterostructures, revealing new physical phenomena relevant for spintronics.

Contribution

It demonstrates how interfacial Dzyaloshinskii-Moriya interaction can manipulate spin textures and induce unique magnetoresistance behaviors in FeSn thin films.

Findings

Tunable spin textures achieved via heavy-metal Pt overlayer.

Observation of damped oscillatory magnetoresistance at low magnetic fields.

Correlation between topological spin textures and magnetotransport properties.

Abstract

Antiferromagnetic Kagome semimetals have attracted tremendous attentions for their potential application in antiferromagnetic topological spintronics. Effectively manipulating Kagome antiferromagnetic states could reveal abundant physical phenomena induced from quantum interactions between topology, spin, and correlation. Here, we achieved tunable spin textures of FeSn thin films via introducing interfacial Dzyaloshinskii Moriya interaction from heavy-metal Pt overlayer. With increasing FeSn thickness, the variable spin textures result in gradual change in Hall resistivity and magnetoresistance. Importantly, an unconventional damped oscillatory-like behavior of magnetoresistance at relatively low magnetic field can be observed in thin FeSn-Pt samples. This oscillatory like magnetoresistance feature was confirmed to be related to the special topological spin textures revealed by magnetic force microscopy measurements. The formation of rich variety of topological spin textures in association with exotic magneto-transport properties in antiferromagnetic Kagome FeSn heterostructures offers new perspectives for understanding the novel emergent phenomena in Kagome antiferromagnets.