Breathing modes of confined skyrmions in ultrathin magnetic dots

Joo-Von Kim, Felipe Garcia-Sanchez, João Sampaio, Constance Moreau-Luchaire, Vincent Cros, and Albert Fert
Phys. Rev. B 90, 064410 – Published 11 August 2014

Abstract

The dynamics of individual magnetic skyrmions confined in ultrathin film dots is studied theoretically. The systems considered are transition-metal ferromagnets possessing perpendicular magnetic anisotropy and particular attention is given to the dynamic response of the skyrmions to perpendicular ac fields. By using micromagnetics simulations, it is shown that breathing modes can hybridize with geometrically quantized spin wave eigenmodes of the circular dots, leading to distinct features in the power spectrum that differ from the behavior expected for uniformly magnetized systems. The static field dependence of the breathing mode frequency offers a direct means of detecting and characterizing such skyrmion states in experiment.

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  • Received 29 May 2014
  • Revised 22 July 2014

DOI:https://doi.org/10.1103/PhysRevB.90.064410

©2014 American Physical Society

Authors & Affiliations

Joo-Von Kim* and Felipe Garcia-Sanchez

  • Institut d'Electronique Fondamentale, UMR CNRS 8622, Université Paris-Sud, 91405 Orsay, France

João Sampaio, Constance Moreau-Luchaire, Vincent Cros, and Albert Fert

  • Unité Mixte de Physique CNRS/Thales, 1 avenue Augustin Fresnel, 91767 Palaiseau, France

  • *joo-von.kim@u-psud.fr

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Issue

Vol. 90, Iss. 6 — 1 August 2014

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