Nonlinear gyrotropic vortex dynamics in ferromagnetic dots

Guslienko, Konstantin Y. and Hernández Heredero, Rafael and Chubykalo-Fesenko, Oksana (2010). Nonlinear gyrotropic vortex dynamics in ferromagnetic dots. "Physical review. B", v. 82 (n. 1); pp.. ISSN 1098-0121. https://doi.org/10.1103/PhysRevB.82.014402.

Description

Title: Nonlinear gyrotropic vortex dynamics in ferromagnetic dots
Author/s:
  • Guslienko, Konstantin Y.
  • Hernández Heredero, Rafael
  • Chubykalo-Fesenko, Oksana
Item Type: Article
Título de Revista/Publicación: Physical review. B
Date: July 2010
ISSN: 1098-0121
Volume: 82
Subjects:
Faculty: E.U.I.T. Telecomunicación (UPM)
Department: Matemática Aplicada a la Ingeniería Técnica de Telecomunicación [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The quasistationary and transient (nanosecond) regimes of nonlinear vortex dynamics in a soft magnetic dot driven by an oscillating external field are studied. We derive a nonlinear dynamical system of equations for the vortex core position and phase, assuming that the main source of nonlinearity comes from the magnetostatic energy. In the stationary regime, we demonstrate the occurrence of a fold-over bifurcation and calculate analytically the resonant nonlinear vortex frequencies as a function of the amplitude and frequency of the applied driving field. In the transient regime, we show that the vortex core dynamics are described by an oscillating trajectory radius. The resulting dynamics contain multiple frequencies with amplitude decaying in time. Finally, we evaluate the ranges of the system parameters leading to a vortex core instability (core polarization reversal).

More information

Item ID: 6691
DC Identifier: http://oa.upm.es/6691/
OAI Identifier: oai:oa.upm.es:6691
DOI: 10.1103/PhysRevB.82.014402
Official URL: http://link.aps.org/doi/10.1103/PhysRevB.82.014402
Deposited by: Memoria Investigacion
Deposited on: 25 Apr 2011 06:51
Last Modified: 10 Nov 2017 09:01
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