Exchange-enhancement of the ultrafast magnetic order dynamics in antiferromagnets

TL;DR

This paper theoretically shows that antiferromagnets exhibit faster ultrafast magnetic order dynamics than ferromagnets due to exchange interactions, validated by simulations.

Contribution

It introduces an equation of motion for magnetic dynamics and demonstrates exchange-enhanced ultrafast responses in antiferromagnets.

Findings

Antiferromagnets have faster magnetic order dynamics than ferromagnets.

Exchange of angular momentum between sublattices accelerates dynamics.

Validated by atomistic spin dynamics simulations.

Abstract

We theoretically demonstrate that the ultrafast magnetic order dynamics in antiferromagnets is exchange-enhanced in comparison to their ferromagnetic counterparts. We provide an equation of motion for the magnetic order dynamics validated by computer simulations using atomistic spin dynamics methods. The exchange of angular momentum between sublattices speeds up the dynamics in antiferromagnets, a process absent in ferromagnets.