Vortex propagation and phase transitions in a chiral antiferromagnetic nanostripe

Riccardo Tomasello and Stavros Komineas
Phys. Rev. B 104, 064438 – Published 23 August 2021

Abstract

We study a vortex in a nanostripe of an antiferromagnet with easy-plane anisotropy and interfacial Dzyaloshinskii-Moriya interaction. The vortex has hybrid chirality, being of Néel type close to its center and of Bloch type away from it. Propagating vortices can acquire velocities up to a maximum value that is lower than the spin wave velocity. Theoretical arguments lead to the general result that the velocity of localized excitations in chiral antiferromagnets cannot reach 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 stabilized in the stripe geometry.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 9 January 2021
  • Accepted 10 August 2021

DOI:https://doi.org/10.1103/PhysRevB.104.064438

©2021 American Physical Society

Physics Subject Headings (PhySH)

  1. Physical Systems
  1. Techniques
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Riccardo Tomasello1 and Stavros Komineas1,2

  • 1Institute of Applied and Computational Mathematics, FORTH, 70013 Heraklion, Crete, Greece
  • 2Department of Mathematics and Applied Mathematics, University of Crete, 70013 Heraklion, Crete, Greece

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 104, Iss. 6 — 1 August 2021

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×