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

Abstract

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.

4 pages, 2 figures

References in corpus (2)

• Bistability of vortex core dynamics in a single perpendicularly magnetized nano-disk
• Universal criterion and phase diagram for switching a magnetic vortex core in soft magnetic nanodots

Cited by in corpus (5)

• Large microwave generation from d.c. driven magnetic vortex oscillators in magnetic tunnel junctions
• Phase locking dynamics of dipolarly coupled vortex-based spin transfer oscillators
• Curvature induced chirality symmetry breaking in vortex core switching phenomena
• Reversal process of a magnetic vortex core under the combined action of a perpendicular field and spin transfer torque
• Indirect switching of vortex polarity through magnetic dynamic coupling