Quantum sensing and imaging of spin-orbit-torque-driven spin dynamics in noncollinear antiferromagnet Mn3Sn

TL;DR

This paper demonstrates the use of nitrogen-vacancy centers to image and analyze spin-orbit-torque-driven spin dynamics and magnetic switching in noncollinear antiferromagnet Mn3Sn, revealing local magnetic behaviors and interactions.

Contribution

It introduces a novel application of NV centers for nanoscale imaging of spin dynamics in Mn3Sn, linking magnetic structure to topological properties.

Findings

Direct evidence of spin dynamics coupling with NV centers

Imaging of deterministic magnetic switching and chiral spin rotation

Potential for exploring topology-magnetism interplay in quantum materials

Abstract

Novel noncollinear antiferromagnets with spontaneous time-reversal symmetry breaking, nontrivial band topology, and unconventional transport properties have received immense research interest over the past decade due to their rich physics and enormous promise in technological applications. One of the central focuses in this emerging field is exploring the relationship between the microscopic magnetic structure and exotic material properties. Here, the nanoscale imaging of both spin-orbit-torque-induced deterministic magnetic switching and chiral spin rotation in noncollinear antiferromagnet Mn3Sn films using nitrogen-vacancy (NV) centers is reported. Direct evidence of the off-resonance dipole-dipole coupling between the spin dynamics in Mn3Sn and proximate NV centers is also demonstrated with NV relaxometry measurements. These results demonstrate the unique capabilities of NV centers in accessing the local information of the magnetic order and dynamics in these emergent quantum materials and suggest new opportunities for investigating the interplay between topology and magnetism in a broad range of topological magnets.