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We investigate how the ability of the vortex oscillation mode of aspin-torque nano-oscillator to lock to an external microwave signal is modifiedwhen it is coupled to another oscillator. We show experimentally that mutualelectrical coupling can lead to locking range enhancements of a factor 1.64.Furthermore, we analyze the evolution of the locking range as a function of thecoupling strength through experiments and numerical simulations. By uncoveringthe mechanisms at stake in the locking range enhancement, our results will beuseful for designing spin-torque nano-oscillators arrays with highsensitivities to external microwave stimuli.

Enhancing the injection locking range of spin torque oscillators through mutual coupling