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We excite the gyrotropic mode of a magnetic vortex and observe the resultingeffect on the spin state of a nearby nitrogen-vacancy (NV) defect in diamond.Thin permalloy disks fabricated on a diamond sample are magnetized in a vortexstate in which the magnetization curls around a central core. The magnetizationdynamics of this configuration are described by a discrete spectrum of confinedmagnon modes, as well as a low-frequency gyrotropic mode in which the vortexcore precesses about its equilibrium position. Despite the spin transitionfrequencies being far-detuned from the modes of the ferromagnet, we observeenhanced relaxation of the NV spin when driving the gyrotropic mode. Moreover,we map the spatial dependence of the interaction between the vortex and thespin by translating the vortex core within the disk with an applied magneticfield, resulting in steplike motion as the vortex is pinned and de-pinned. Thestrong spin relaxation is observed when the vortex core is within approximately250 nm of the NV center defect. We attribute this effect to the higherfrequencies in the spectrum of the magnetic fringe field arising from thesoliton-like nature of the gyrotropic mode when driven with sufficiently largeamplitude.

Relaxation of a single defect spin by the low-frequency gyrotropic mode of a magnetic vortex