We study the synchronization of the auto-oscillation signal generated by thespin transfer driven dynamics of two coupled vortices in a spin-valvenanopillar to an external source. Phase-locking to the microwave field hrfoccurs in a range larger than 10% of the oscillator frequency for driveamplitudes of only a few Oersteds. Using synchronization at the doublefrequency, the generation linewidth is found to decrease by more than fiveorders of magnitude in the phase-locked regime (down to 1 Hz, limited by theresolution bandwidth of the spectrum analyzer) in comparison to the freerunning regime (140 kHz). This perfect phase-locking holds for frequencydetuning as large as 2 MHz, which proves its robustness. We also analyze howthe free running spectral linewidth impacts the main characteristics of thesynchronization regime.
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