Vortex Core Switching by Coherent Excitation with Single In-Plane Magnetic Field Pulses

Abstract

The response of magnetic vortex cores to subnanosecond in-plane magnetic field pulses was studied by time-resolved x-ray microscopy.
Vortex core reversal was observed and the switching events were located
in space and time. This revealed a mechanism of coherent excitation by
the leading and trailing edges of the pulse, lowering the field
amplitude required for switching. The mechanism was confirmed by
micromagnetic simulations and can be understood in terms of gyration
around the vortex equilibrium positions, displaced by the applied field.