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Vortex-state oscillations in soft magnetic cylindrical dots

Guslienko, K.Yu., Scholz, W., Chantrell, R.W. and Novosad, V. (2005) Vortex-state oscillations in soft magnetic cylindrical dots. Physical Review B, 71 (14). 144407-8 Pages. ISSN 1550-235X

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We have studied magnetic vortex oscillations in soft submicron cylindrical dots with variable thickness and diameter by an analytical approach and micromagnetic simulations. We have considered two kinds of modes of the vortex magnetization oscillations: (1) low-frequency translation mode, corresponding to the movement of the vortex as a whole near its equilibrium position and (2) high-frequency vortex modes, which correspond to radially symmetric oscillations of the vortex magnetization, mainly outside the vortex core. The vortex translational eigenmode was calculated numerically in frequency and time domains for different dot aspect ratios. To describe the discrete set of vortex high-frequency modes we applied the linearized equation of motion of dynamic magnetization over the vortex ground state. We considered only radially symmetric magnetization oscillations modes. The eigenfrequencies of both kinds of the excitation modes are determined by magnetostatic interactions. They are proportional to the thickness/diameter ratio and lie in the GHz range for typical dot sizes.

Item Type: Article
Institution: The University of York
Academic Units: The University of York > Physics (York)
Depositing User: York RAE Import
Date Deposited: 06 Mar 2009 11:08
Last Modified: 06 Mar 2009 11:08
Published Version: http://dx.doi.org/10.1103/PhysRevB.71.144407
Status: Published
Publisher: The American Physical Society.
Identification Number: 10.1103/PhysRevB.71.144407
URI: http://eprints.whiterose.ac.uk/id/eprint/7194

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