Perfect and robust phase-locking of a spin transfer vortex nano-oscillator to an external microwave source

Abstract : We study the synchronization of the auto-oscillation signal generated by the spin transfer driven dynamics of two coupled vortices in a spin-valve nanopillar to an external source. Phase-locking to the microwave field hrf occurs in a range larger than 10% of the oscillator frequency for drive amplitudes of only a few Oersteds. Using synchronization at the double frequency, the generation linewidth is found to decrease by more than five orders of magnitude in the phase-locked regime (down to 1 Hz, limited by the resolution bandwidth of the spectrum analyzer) in comparison to the free running regime (140 kHz). This perfect phase-locking holds for frequency detuning as large as 2 MHz, which proves its robustness. We also analyze how the free running spectral linewidth impacts the main characteristics of the synchronization regime.
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https://hal.archives-ouvertes.fr/hal-00910188
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Submitted on : Wednesday, November 27, 2013 - 3:26:40 PM
Last modification on : Thursday, January 24, 2019 - 1:14:25 AM
Long-term archiving on : Monday, March 3, 2014 - 4:45:51 PM

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  • HAL Id : hal-00910188, version 1
  • ARXIV : 1311.7096

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A. Hamadeh, Nicolas Locatelli, V. V. Naletov, Romain Lebrun, G. de Loubens, et al.. Perfect and robust phase-locking of a spin transfer vortex nano-oscillator to an external microwave source. 2013. ⟨hal-00910188⟩

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