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Radiofrequency vortex spin-transfer oscillators based on magnetic tunneljunctions with very low resistance area product were investigated. A high powerof excitations has been obtained characterized by a power spectral densitycontaining a very sharp peak at the fundamental frequency and a series ofharmonics. The observed behaviour is ascribed to the combined effect of spintransfer torque and Oersted-Amp\`ere field generated by the large applieddc-current. We furthermore show that the synchronization of a vortexoscillation by applying a ac bias current is mostly efficient when the externalfrequency is twice the oscillator fundamental frequency. This result isinterpreted in terms of a parametric oscillator.

Parametric oscillator based on non-linear vortex dynamics in low resistance magnetic tunnel junctions