Noncollinear antiferromagnetic textures driven high harmonic generation from magnetic dynamics in the absence of spin-orbit coupling

TL;DR

This paper shows that noncollinear antiferromagnetic textures can generate high harmonic signals through magnetic dynamics without relying on spin-orbit coupling, opening new avenues in ultrafast spintronics.

Contribution

It introduces a mechanism for high harmonic generation driven by magnetic textures and dynamics, independent of spin-orbit interaction, in antiferromagnetic materials.

Findings

High harmonics are generated in carrier pumping from magnetic textures.

The process is intrinsic and governed by s-d exchange interactions.

Spin-orbit coupling is not necessary for harmonic generation.

Abstract

We demonstrate the generation of high order harmonics in carrier pumping from precessing ferromagnetic or antiferromagnetic orders, excited via magnetic resonance, in the presence of topological antiferromagnetic textures. This results in an enhancement of the carrier dynamics by orders of magnitude. Interestingly, the generation process occurs in an intrinsic manner, and is solely governed by the interplay between the s-d exchange coupling underlying the noncollinear antiferromagnetic order and the dynamical s-d exchange parameter of the magnetic drive. Therefore, the relativistic spin-orbit interaction is not required for the emergence of high harmonics in the pumped currents. Accordingly, the noncollinear topological antiferromagnetic order is presented as an alternative to spin-orbit interaction for the purpose of harnessing high harmonic emission in carrier pumping. Our proposal initiates a tantalizing perspective for the exploitation of topological magnetic textures in the context of the highly active domain of ultrafast spintronics.