Magnetic-field control of topological electronic response near room temperature in correlated Kagome magnets

TL;DR

This study demonstrates the ability to control topological electronic responses near room temperature in correlated Kagome magnets through small magnetic fields, revealing potential for future topological device applications.

Contribution

It introduces a method to tune local magnetism and topological responses in Fe3Sn2 Kagome magnets using small magnetic fields, highlighting a new platform for correlated topological materials.

Findings

Magnetic fields effectively tune bulk spin direction and domain texture.

Magnetoresistivity shows anisotropic weak localization behavior.

Dirac fermions can be directly controlled via magnetic field manipulation.

Abstract

Strongly correlated Kagome magnets are promising candidates for achieving controllable topological devices owing to the rich interplay between inherent Dirac fermions and correlation-driven magnetism. Here we report tunable local magnetism and its intriguing control of topological electronic response near room temperature in the Kagome magnet Fe3Sn2 using small angle neutron scattering, muon spin rotation, and magnetoresistivity measurement techniques. The average bulk spin direction and magnetic domain texture can be tuned effectively by small magnetic fields. Magnetoresistivity, in response, exhibits a measurable degree of anisotropic weak localization behavior, which allows the direct control of Dirac fermions with strong electron correlations. Our work points to a novel platform for manipulating emergent phenomena in strongly-correlated topological materials relevant to future applications.