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Tsunegi S, Grimaldi E, Lebrun R, et al. Self-Injection Locking of a Vortex Spin Torque Oscillator by Delayed Feedback. Sci Rep. 2016;6:26849doi: 10.1038/srep26849.
Tsunegi, S., Grimaldi, E., Lebrun, R., Kubota, H., Jenkins, A. S., Yakushiji, K., Fukushima, A., Bortolotti, P., Grollier, J., Yuasa, S., & Cros, V. (2016). Self-Injection Locking of a Vortex Spin Torque Oscillator by Delayed Feedback. Scientific reports, 626849. https://doi.org/10.1038/srep26849
Tsunegi, Sumito, et al. "Self-Injection Locking of a Vortex Spin Torque Oscillator by Delayed Feedback." Scientific reports vol. 6 (2016): 26849. doi: https://doi.org/10.1038/srep26849
Tsunegi S, Grimaldi E, Lebrun R, Kubota H, Jenkins AS, Yakushiji K, Fukushima A, Bortolotti P, Grollier J, Yuasa S, Cros V. Self-Injection Locking of a Vortex Spin Torque Oscillator by Delayed Feedback. Sci Rep. 2016 May 31;6:26849. doi: 10.1038/srep26849. PMID: 27241747; PMCID: PMC4886513.
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Sci Rep. 2016 May 31;6:26849. doi: 10.1038/srep26849.

Self-Injection Locking of a Vortex Spin Torque Oscillator by Delayed Feedback.

Scientific reports

Sumito Tsunegi, Eva Grimaldi, Romain Lebrun, Hitoshi Kubota, Alex S Jenkins, Kay Yakushiji, Akio Fukushima, Paolo Bortolotti, Julie Grollier, Shinji Yuasa, Vincent Cros

Affiliations

  1. National Institute of Advanced Industrial Science and Technology (AIST), Spintronics Research Center, Tsukuba, Japan.
  2. Unité Mixte de Physique, CNRS, Thales, Unive. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France.

PMID: 27241747 PMCID: PMC4886513 DOI: 10.1038/srep26849

Abstract

The self-synchronization of spin torque oscillators is investigated experimentally by re-injecting its radiofrequency (rf) current after a certain delay time. We demonstrate that the integrated power and spectral linewidth are improved for optimal delays. Moreover by varying the phase difference between the emitted power and the re-injected one, we find a clear oscillatory dependence on the phase difference with a 2π periodicity of the frequency of the oscillator as well as its power and linewidth. Such periodical behavior within the self-injection regime is well described by the general model of nonlinear auto-oscillators including not only a delayed rf current but also all spin torque forces responsible for the self-synchronization. Our results reveal new approaches for controlling the non-autonomous dynamics of spin torque oscillators, a key issue for rf spintronics applications as well as for the development of neuro-inspired spin-torque oscillators based devices.

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