Critical velocity for the vortex core reversal in perpendicular bias magnetic field

For a circular magnetic nanodot in a vortex ground state we study how the critical velocity \(v_c\) of the vortex core reversal depends on the magnitude \(H\) of a bias magnetic field applied perpendicularly to the dot plane. We find that, similarly to the case \(H\) = 0, the critical velocity does...

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Bibliographic Details
Published in:arXiv.org 2009-11
Main Authors: Khvalkovskiy, Alexey V, Slavin, Andrei N, Grollier, Julie, Zvezdin, Konstantin A, Konstantin Yu Guslienko
Format: Article
Language:English
Subjects:
Bias
Critical velocity
Magnetic fields
Mathematical models
Velocity
Vortices
Online Access:Get full text
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Summary:For a circular magnetic nanodot in a vortex ground state we study how the critical velocity \(v_c\) of the vortex core reversal depends on the magnitude \(H\) of a bias magnetic field applied perpendicularly to the dot plane. We find that, similarly to the case \(H\) = 0, the critical velocity does not depend on the size of the dot. The critical velocity is dramatically reduced when the negative (i.e. opposite to the vortex core direction) bias field approaches the value, at which a \emph{static} core reversal takes place. A simple analytical model shows good agreement with our numerical result.
ISSN:2331-8422
DOI:10.48550/arxiv.0911.3033