Chaos in magnetic nanocontact vortex oscillators

Jeremy Letang; Thibaut Devolder; Damien Rontani; Sébastien Petit-Watelot; Karim Bouzehouane; Stéphane Andrieu; Myoung-Woo Yoo; Jean-Paul Adam; Claude Chappert; Stéphanie Girod; Vincent Cros; Marc Sciamanna; Joo-Von Kim

doi:https://doi.org/10.1103/PhysRevLett.123.147701

Chaos in magnetic nanocontact vortex oscillators

Jeremy Letang, Thibaut Devolder, Damien Rontani, Sébastien Petit-Watelot, Karim Bouzehouane, Stéphane Andrieu, Myoung-Woo Yoo, Jean-Paul Adam, Claude Chappert, Stéphanie Girod, Vincent Cros, Marc Sciamanna, Joo-Von Kim

Research output: Contribution to journal › Article › peer-review

Abstract

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

Original language	English
Journal	Physical review letters
Volume	123
Issue number	147701
DOIs	https://doi.org/10.1103/PhysRevLett.123.147701
Publication status	Published - 1 Oct 2019
Externally published	Yes

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https://doi.org/10.1103/PhysRevLett.123.147701

https://arxiv.org/abs/1903.00921

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title = "Chaos in magnetic nanocontact vortex oscillators",

abstract = "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 modulationleads to the appearance of commensurate but also, more interestingly here, incommensurate states, which are characterized by devil{\textquoteright}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",

author = "Jeremy Letang and Thibaut Devolder and Damien Rontani and S{\'e}bastien Petit-Watelot and Karim Bouzehouane and St{\'e}phane Andrieu and Myoung-Woo Yoo and Jean-Paul Adam and Claude Chappert and St{\'e}phanie Girod and Vincent Cros and Marc Sciamanna and Joo-Von Kim",

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doi = "https://doi.org/10.1103/PhysRevLett.123.147701",

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TY - JOUR

T1 - Chaos in magnetic nanocontact vortex oscillators

AU - Letang, Jeremy

AU - Devolder, Thibaut

AU - Rontani, Damien

AU - Petit-Watelot, Sébastien

AU - Bouzehouane, Karim

AU - Andrieu, Stéphane

AU - Yoo, Myoung-Woo

AU - Adam, Jean-Paul

AU - Chappert, Claude

AU - Girod, Stéphanie

AU - Cros, Vincent

AU - Sciamanna, Marc

AU - Kim, Joo-Von

PY - 2019/10/1

Y1 - 2019/10/1

N2 - 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 modulationleads 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

AB - 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 modulationleads 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

U2 - https://doi.org/10.1103/PhysRevLett.123.147701

DO - https://doi.org/10.1103/PhysRevLett.123.147701

M3 - Article

VL - 123

JO - Physical review letters

JF - Physical review letters

IS - 147701

ER -

Chaos in magnetic nanocontact vortex oscillators

Abstract

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