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Commensurability and chaos in magnetic vortex oscillations

Sebastien Petit-Watelot, Joo-Von Kim, Antonio Ruotolo, Ruben Otxoa, Karim Bouzehouane, Julie Grollier, Arne Vansteenkiste UGent, Ben Van de Wiele UGent, Vincent Cros and Thibaut Devolder (2012) NATURE PHYSICS. 8(9). p.682-687
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.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
EXCITATION, DRIVEN, VORTICES, DYNAMICS
journal title
NATURE PHYSICS
Nat. Phys.
volume
8
issue
9
pages
682 - 687
Web of Science type
Article
Web of Science id
000308633200018
JCR category
PHYSICS, MULTIDISCIPLINARY
JCR impact factor
19.352 (2012)
JCR rank
3/83 (2012)
JCR quartile
1 (2012)
ISSN
1745-2473
DOI
10.1038/NPHYS2362
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
3033139
handle
http://hdl.handle.net/1854/LU-3033139
date created
2012-10-23 11:26:05
date last changed
2012-10-24 11:25:04
@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},
  keyword      = {EXCITATION,DRIVEN,VORTICES,DYNAMICS},
  language     = {eng},
  number       = {9},
  pages        = {682--687},
  title        = {Commensurability and chaos in magnetic vortex oscillations},
  url          = {http://dx.doi.org/10.1038/NPHYS2362},
  volume       = {8},
  year         = {2012},
}

Chicago
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.
APA
Petit-Watelot, S., Kim, J.-V., Ruotolo, A., Otxoa, R., Bouzehouane, K., Grollier, J., Vansteenkiste, A., et al. (2012). Commensurability and chaos in magnetic vortex oscillations. NATURE PHYSICS, 8(9), 682–687.
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.
MLA
Petit-Watelot, Sebastien, Joo-Von Kim, Antonio Ruotolo, et al. “Commensurability and Chaos in Magnetic Vortex Oscillations.” NATURE PHYSICS 8.9 (2012): 682–687. Print.