Brownian motion of magnetic domain walls and skyrmions, and their diffusion constants

Jacques Miltat, Stanislas Rohart, and André Thiaville
Phys. Rev. B 97, 214426 – Published 22 June 2018

Abstract

Extended numerical simulations enable us to ascertain the diffusive behavior at finite temperatures of chiral walls and skyrmions in ultrathin model Co layers exhibiting symmetric—Heisenberg—as well as antisymmetric—Dzyaloshinskii-Moriya—exchange interactions. The Brownian motion of walls and skyrmions is shown to obey markedly different diffusion laws as a function of the damping parameter. Topology related skyrmion diffusion suppression with vanishing damping parameter, albeit already documented, is shown to be restricted to ultrasmall skyrmion sizes or, equivalently, to ultralow damping coefficients, possibly hampering observation.

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  • Received 11 April 2018

DOI:https://doi.org/10.1103/PhysRevB.97.214426

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jacques Miltat*, Stanislas Rohart, and André Thiaville

  • Laboratoire de Physique des Solides, Université Paris-Sud, Université Paris-Saclay, CNRS, UMR 8502, F-91405 Orsay Cedex, France

  • *jacques.miltat@u-psud.fr

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Issue

Vol. 97, Iss. 21 — 1 June 2018

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