Magnetic vortex dynamics on a picoseconds timescale in a hexagonal Permalloy pattern

Abstract

We observed a motion of magnetic vortex core in a hexagonal Permalloy pattern by means of soft x-ray microscopy. Pump-probe stroboscopic observation on a picosecond timescale has been carried out after exciting a ground state vortex structure by an external field pulse of 1 ns duration. Vortex core is excited off from the center position of the hexagonal pattern but the analysis of the core trajectory reveals that the motion is nongyrotropic. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3358223]