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

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

2009-11-16

arxiv.org/abs/0911.3033v1

Physics

Condensed Matter

Materials Science

4 pages, 2 figures

Scientific paper

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.

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