Chaos in Magnetic Nanocontact Vortex Oscillators

We present an experimental study of spin-torque driven vortex self-oscillations in magnetic nanocontacts. We find that, above a certain threshold in applied currents, the vortex gyration around the nanocontact is modulated by relaxation oscillations, which involve periodic reversals of the vortex co...

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Bibliographic Details
Published in:Physical review letters 2019-10, Vol.123 (14), p.147701-147701, Article 147701
Main Authors: Devolder, Thibaut, Rontani, Damien, Petit-Watelot, Sébastien, Bouzehouane, Karim, Andrieu, Stéphane, Létang, Jérémy, Yoo, Myoung-Woo, Adam, Jean-Paul, Chappert, Claude, Girod, Stéphanie, Cros, Vincent, Sciamanna, Marc, Kim, Joo-Von
Format: Article
Language:English
Subjects:
Condensed Matter
Materials Science
Modulation
Oscillators
Other
Physics
Relaxation oscillations
Staircases
Vortices
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Summary:We present an experimental study of spin-torque driven vortex self-oscillations in magnetic nanocontacts. We find that, above a certain threshold in applied currents, the vortex gyration around the nanocontact is modulated by relaxation oscillations, which involve periodic reversals of the vortex core. This modulation leads to the appearance of commensurate but also, more interestingly here, incommensurate states, which are characterized by devil's staircases in the modulation frequency. We use frequency- and time-domain measurements together with advanced time-series analyses to provide experimental evidence of chaos in incommensurate states of vortex oscillations, in agreement with theoretical predictions.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.123.147701