Current-driven skyrmion expulsion from magnetic nanostrips

Myoung-Woo Yoo, Vincent Cros, and Joo-Von Kim
Phys. Rev. B 95, 184423 – Published 22 May 2017

Abstract

We study the current-driven skyrmion expulsion from magnetic nanostrips using micromagnetic simulations and analytic calculations. We explore the threshold current density for the skyrmion expulsion, and show that this threshold is determined by the critical boundary force as well as the spin-torque parameters. We also find the dependence of the critical boundary force on the magnetic parameters; the critical boundary force decreases with increasing the exchange stiffness and perpendicular anisotropy constants, while it increases with increasing Dzyaloshinskii-Moriya interaction and saturation magnetization constants. Using a simple model describing the skyrmion and locally-tilted edge magnetization, we reveal the underlying physics of the dependence of the critical boundary force on the magnetic parameters based on the relation between the scaled Dzyaloshinskii-Moriya-interaction parameter and the critical boundary force. This work provides a fundamental understanding of the skyrmion expulsion and the interaction between the skymion and boundaries of devices and shows that the stability of the skyrmion in devices can be related to the scaled Dzyaloshinskii-Moriya-interaction parameter of magnetic materials.

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  • Received 9 January 2017
  • Revised 20 March 2017

DOI:https://doi.org/10.1103/PhysRevB.95.184423

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Myoung-Woo Yoo1,2,*, Vincent Cros2, and Joo-Von Kim1,†

  • 1Centre de Nanosciences et de Nanotechnologies, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay, France
  • 2Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France

  • *myoung-woo.yoo@u-psud.fr
  • joo-von.kim@u-psud.fr

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Issue

Vol. 95, Iss. 18 — 1 May 2017

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