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Chaos in Magnetic Nanocontact Vortex Oscillators

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
Source :
Phys. Rev. Lett. 123, 147701 (2019)
Publication Year :
2019

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.<br />Comment: 5 pages, 4 figures

Details

Database :
arXiv
Journal :
Phys. Rev. Lett. 123, 147701 (2019)
Publication Type :
Report
Accession number :
edsarx.1903.00921
Document Type :
Working Paper
Full Text :
https://doi.org/10.1103/PhysRevLett.123.147701