Pattern generation and symbolic dynamics in a nanocontact vortex oscillator

Myoung-Woo Yoo (), Damien Rontani, Jérémy Létang, Sébastien Petit-Watelot, Thibaut Devolder, Marc Sciamanna, Karim Bouzehouane, Vincent Cros and Joo- Von Kim ()
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Myoung-Woo Yoo: Université Paris-Saclay
Damien Rontani: Université de Lorraine & CentraleSupélec
Jérémy Létang: Université Paris-Saclay
Sébastien Petit-Watelot: Campus Artem
Thibaut Devolder: Université Paris-Saclay
Marc Sciamanna: Université de Lorraine & CentraleSupélec
Karim Bouzehouane: Université Paris-Saclay
Vincent Cros: Université Paris-Saclay
Joo- Von Kim: Université Paris-Saclay

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Harnessing chaos or intrinsic nonlinear behaviours of dynamical systems is a promising avenue toward unconventional information processing technologies. In this light, spintronic devices are promising because of the inherent nonlinearity of magnetization dynamics. Here, we demonstrate experimentally the potential for chaos-based schemes using nanocontact vortex oscillators by unveiling and characterizing their waveform patterns and symbolic dynamics using time-resolved electrical measurements. We dissociate nonlinear deterministic patterns from thermal fluctuations and show that the emergence of chaos results in the unpredictable alternation of well-defined patterns. With phase-space reconstruction techniques, we perform symbolic analyses of the time series and show that the oscillator exhibits maximal entropy and complexity at the centre of its incommensurate region. This suggests that such vortex-based systems are promising nanoscale sources of entropy that could be exploited for information processing.

Date: 2020
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DOI: 10.1038/s41467-020-14328-7

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