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Chaos in Magnetic Nanocontact Vortex Oscillators

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arxiv 1903.00921 v2 pith:S6J7A535 submitted 2019-03-03 cond-mat.mes-hall nlin.CD

Thibaut Devolder , Damien Rontani , Sébastien Petit-Watelot , Karim Bouzehouane , Stéphane Andrieu , Jérémy Létang , Myoung-Woo Yoo , Jean-Paul Adam
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Claude Chappert Stéphanie Girod Vincent Cros Marc Sciamanna Joo-Von Kim
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classification cond-mat.mes-hallnlin.CD
keywords vortexchaosexperimentalincommensuratemagneticmodulationnanocontactoscillations
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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.

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