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In a vortex-state magnetic nano-disk, the static magnetization is curling inthe plane, except in the core region where it is pointing out-of-plane, eitherup or down leading to two possible stable states of opposite core polarity p.Dynamical reversal of p by large amplitude motion of the vortex core hasrecently been demonstrated experimentally,raising fundamental interest forpotential application in magnetic storage devices. Here we demonstrate coherentcontrol of p by single and double microwave pulse sequences, taking advantageof the resonant vortex dynamics in a perpendicular bias magnetic field.Optimization of the microwave pulse duration required to switch p allows toexperimentally infer the characteristic decay time of the vortex core in thelarge oscillation regime. It is found to be more than twice shorter than in thesmall oscillation regime, raising the fundamental question of the non-linearbehaviour of magnetic dissipation.

Optimal control of vortex core polarity by resonant microwave pulses