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Commensurability and chaos in magnetic vortex oscillations

(2012) NATURE PHYSICS. 8(9). p.682-687
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Abstract
Magnetic vortex dynamics in thin films is characterized by gyrotropic motion, the sense of gyration depending on the vortex core polarity, which reverses when a critical velocity is reached. Although self-sustained vortex oscillations in nanoscale systems are known to be possible, the precise role of core reversal in such dynamics remains unknown. Here we report on an experimental observation of periodic core reversal during self-sustained vortex gyration in a magnetic nanocontact system. By tuning the ratio between the gyration frequency and the rate of core reversal, we show that commensurate phase-locked and incommensurate chaotic states are possible, resulting in Devil's staircases with driving currents. These systems could have the potential to serve as tunable nanoscale radiofrequency electrical oscillators for secure communications, allowing schemes such as encryption by chaos on demand.
Keywords
EXCITATION, DRIVEN, VORTICES, DYNAMICS

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MLA
Petit-Watelot, Sebastien, et al. “Commensurability and Chaos in Magnetic Vortex Oscillations.” NATURE PHYSICS, vol. 8, no. 9, 2012, pp. 682–87, doi:10.1038/NPHYS2362.
APA
Petit-Watelot, S., Kim, J.-V., Ruotolo, A., Otxoa, R., Bouzehouane, K., Grollier, J., … Devolder, T. (2012). Commensurability and chaos in magnetic vortex oscillations. NATURE PHYSICS, 8(9), 682–687. https://doi.org/10.1038/NPHYS2362
Chicago author-date
Petit-Watelot, Sebastien, Joo-Von Kim, Antonio Ruotolo, Ruben Otxoa, Karim Bouzehouane, Julie Grollier, Arne Vansteenkiste, Ben Van de Wiele, Vincent Cros, and Thibaut Devolder. 2012. “Commensurability and Chaos in Magnetic Vortex Oscillations.” NATURE PHYSICS 8 (9): 682–87. https://doi.org/10.1038/NPHYS2362.
Chicago author-date (all authors)
Petit-Watelot, Sebastien, Joo-Von Kim, Antonio Ruotolo, Ruben Otxoa, Karim Bouzehouane, Julie Grollier, Arne Vansteenkiste, Ben Van de Wiele, Vincent Cros, and Thibaut Devolder. 2012. “Commensurability and Chaos in Magnetic Vortex Oscillations.” NATURE PHYSICS 8 (9): 682–687. doi:10.1038/NPHYS2362.
Vancouver
1.
Petit-Watelot S, Kim J-V, Ruotolo A, Otxoa R, Bouzehouane K, Grollier J, et al. Commensurability and chaos in magnetic vortex oscillations. NATURE PHYSICS. 2012;8(9):682–7.
IEEE
[1]
S. Petit-Watelot et al., “Commensurability and chaos in magnetic vortex oscillations,” NATURE PHYSICS, vol. 8, no. 9, pp. 682–687, 2012.
@article{3033139,
  abstract     = {{Magnetic vortex dynamics in thin films is characterized by gyrotropic motion, the sense of gyration depending on the vortex core polarity, which reverses when a critical velocity is reached. Although self-sustained vortex oscillations in nanoscale systems are known to be possible, the precise role of core reversal in such dynamics remains unknown. Here we report on an experimental observation of periodic core reversal during self-sustained vortex gyration in a magnetic nanocontact system. By tuning the ratio between the gyration frequency and the rate of core reversal, we show that commensurate phase-locked and incommensurate chaotic states are possible, resulting in Devil's staircases with driving currents. These systems could have the potential to serve as tunable nanoscale radiofrequency electrical oscillators for secure communications, allowing schemes such as encryption by chaos on demand.}},
  author       = {{Petit-Watelot, Sebastien and Kim, Joo-Von and Ruotolo, Antonio and Otxoa, Ruben and Bouzehouane, Karim and Grollier, Julie and Vansteenkiste, Arne and Van de Wiele, Ben and Cros, Vincent and Devolder, Thibaut}},
  issn         = {{1745-2473}},
  journal      = {{NATURE PHYSICS}},
  keywords     = {{EXCITATION,DRIVEN,VORTICES,DYNAMICS}},
  language     = {{eng}},
  number       = {{9}},
  pages        = {{682--687}},
  title        = {{Commensurability and chaos in magnetic vortex oscillations}},
  url          = {{http://doi.org/10.1038/NPHYS2362}},
  volume       = {{8}},
  year         = {{2012}},
}

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