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Chaos in Magnetic Nanocontact Vortex Oscillators
Thibaut Devolder1, Damien Rontani2,3, Sébastien Petit-Watelot4
1Centre de Nanosciences et de Nanotechnologies, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91120 Palaiseau, France.
Physical Review Letters
|November 9, 2019
Summary
Spin-torque driven vortex oscillations in magnetic nanocontacts exhibit chaotic behavior. New experimental evidence reveals complex dynamics, including devil
Area of Science:
- Spintronics
- Condensed Matter Physics
- Nonlinear Dynamics
Background:
- Spin-torque phenomena are crucial for magnetic device applications.
- Vortex dynamics in magnetic nanocontacts are not fully understood.
- Understanding nonlinear oscillations is key to advanced magnetic memory and logic.
Purpose of the Study:
- To experimentally investigate spin-torque driven vortex self-oscillations in magnetic nanocontacts.
- To characterize the complex dynamics, including relaxation oscillations and chaotic states.
- To provide experimental evidence for chaos in incommensurate vortex oscillation states.
Main Methods:
- Experimental study of spin-torque driven vortex dynamics.
- Applied current threshold analysis.
- Frequency- and time-domain measurements.
- Advanced time-series analyses.
Main Results:
- Above a critical current, vortex gyration is modulated by relaxation oscillations with core reversals.
- Commensurate and incommensurate states emerge.
- Incommensurate states exhibit devil's staircases in modulation frequency.
- Experimental evidence for chaos in incommensurate states was found.
Conclusions:
- Spin-torque driven vortex dynamics in nanocontacts can exhibit complex nonlinear behavior.
- Chaos is experimentally confirmed in incommensurate vortex oscillation states.
- Findings align with theoretical predictions and advance understanding of spintronic phenomena.
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