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We present a study of the piezostrain-tunable gyrotropic dynamics inCo$_{40}$Fe$_{40}$B$_{20}$ vortex microstructures fabricated on a 0.7PMN-0.3PTsingle crystalline substrate. Using field-modulated spin rectificationmeasurements, we demonstrate large frequency tunability (up to 45 %) inindividual microdisks accessed locally with low surface voltages, andmagnetoresistive readout. With increased voltage applied to the PMN-PT, weobserve a gradual decrease of the vortex core gyrotropic frequency associatedwith the strain-induced magnetoelastic energy contribution. The frequencytunability strongly depends on the disk size, with increased frequencydownshift for the disks with larger diameter. Micromagnetic simulations suggestthat the observed size effects originate from the joint action of thestrain-induced magnetoelastic and demagnetizing energies in large magneticdisks. These results enable a selective energy-efficient tuning of the vortexgyrotropic frequency in individual vortex-based oscillators with all-electricaloperation.

Piezostrain -- a local handle to control gyrotropic dynamics in magnetic vortices