Vortex propagation and phase transitions in a chiral antiferromagnetic nanostripe

Abstract

We study a vortex in a nanostripe of an antiferromagnet with easy-plane anisotropy and interfacial Dzyloshinskii-Moriya interaction. The vortex has hybrid chirality being Néel close to its center and Bloch away from it. Propagating vortices can acquire velocities up to a maximum value that is lower than the spin wave velocity. When the vortex is forced to exceed the maximum velocity, phase transitions occur to a nonflat spiral, vortex chain, and flat spiral, successively. The vortex chain is a topological configuration stabilised in the stripe geometry. Theoretical arguments lead to the general result that the velocity of localized excitations in chiral magnets cannot reach the spin wave velocity.

References in corpus (8)

• Antiferromagnetic Half-skyrmions and Bimerons at room temperature
• Imaging current-induced switching of antiferromagnetic domains in CuMnAs
• Ultrafast Switching of Antiferromagnets via Spin-transfer Torque
• Skyrmion-(Anti)Vortex Coupling in a Chiral Magnet-Superconductor Heterostructure
• Imaging of current induced Néel vector switching in antiferromagnetic Mn${}_2$Au
• Rotating vortex dipoles in ferromagnets
• Towards skyrmion-superconductor hybrid systems
• Domain periodicity in an easy-plane antiferromagnet with Dzyaloshinskii-Moriya interaction