Current-driven nucleation and propagation of antiferromagnetic skyrmionium

S. A. Obadero, Y. Yamane, C. A. Akosa, G. Tatara

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We present a theoretical study on nucleation and propagation of antiferromagnetic skyrmionium induced by spin current injection. A skyrmionium, also known as 2π skyrmion, is a vortexlike magnetic structure characterized by a topological charge, the so-called skyrmion number, being zero. We find that an antiferromagnetic skyrmionium can be generated via a local injection of spin current with toroidal distribution. We examine the threshold current density for successful skyrmionium nucleation and the robustness of the proposed mechanism against thermal fluctuation. A spatially uniform spin current is then demonstrated to induce propagation of the skyrmionium. We derive an expression for the skyrmionium velocity based on a collective-coordinate model, which agrees well with our numerical results.

Original languageEnglish
Article number014458
JournalPhysical Review B
Volume102
Issue number1
DOIs
Publication statusPublished - 2020 Jul 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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