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

Romera Rabasa, Miguel Álvaro; Talatchian, P.; Lebrun, R.; Merazzo, K. J.; Bortolotti, P.; Vila, L.; Costa, J. D.; Ferreira, R.; Freitas, P. P.; Cyrille, M. C.; Ebels, U.; Cros, V.; Grollier, J.

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

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Official URL

https://pubs.aip.org/aip/apl/article/109/25/252404/32065/Enhancing-the-injection-locking-range-of-spin

Publication date

2016

Authors

Romera Rabasa, Miguel Álvaro

Publisher

American Institute of Physics

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URI

https://hdl.handle.net/20.500.14352/96069

Citation

M. Romera, P. Talatchian, R. Lebrun, K. J. Merazzo, P. Bortolotti, L. Vila, J. D. Costa, R. Ferreira, P. P. Freitas, M.-C. Cyrille, U. Ebels, V. Cros, J. Grollier; Enhancing the injection locking range of spin torque oscillators through mutual coupling. Appl. Phys. Lett. 19 December 2016; 109 (25): 252404. https://doi.org/10.1063/1.4972346

Abstract

We investigate how the ability of the vortex oscillation mode of a spin-torque nano-oscillator to lock to an external microwave signal is modified when it is coupled to another oscillator. We show experimentally that the mutual electrical 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 the coupling strength through experiments and numerical simulations. By uncovering the mechanisms at stake in the locking range enhancement, our results will be useful for designing spin-torque nano-oscillator arrays with high sensitivities to external microwave stimuli. Published by AIP Publishing.