Tuning of topological properties in the strongly correlated antiferromagnet Mn$_3$Sn via Fe doping

TL;DR

This study explores how Fe doping in Mn$_3$Sn influences its magnetic and topological properties, revealing significant changes in magnetic behavior and the emergence of a large topological Hall effect due to induced anisotropy and spin textures.

Contribution

It demonstrates the tunability of topological properties in Mn$_3$Sn through Fe doping, highlighting the relationship between magnetic anisotropy, spin textures, and topological effects.

Findings

Fe doping significantly alters magnetic properties at low temperatures.

Large topological Hall effect observed in doped samples.

Topological properties are highly sensitive to Fe concentration.

Abstract

Magnetic topological materials, in which strong correlations between magnetic and electronic properties of matter, give rise to various exotic phenomena such as anomalous Hall effect (AHE), topological Hall effect (THE), and skyrmion lattice. Here, we report on the electronic, magnetic, and topological properties of Mn$_{3-\it{x}}$Fe$_{\it{x}}$Sn single crystals ($\it{x}$=0, 0.25, and 0.35). Low temperature magnetic properties have been significantly changed with Fe doping. Most importantly, we observe that large uniaxial magnetocrystalline anisotropy that is induced by the Fe doping in combination with competing magnetic interactions at low temperature produce nontrivial spin-texture, leading to large topological Hall effect in the doped systems at low temperatures. Our studies further show that the topological properties of Mn$_{3-\it{x}}$Fe$_{\it{x}}$Sn are very sensitive to the Fe doping.