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Chaotic dynamics in a macrospin spin-torque nano-oscillator with delayed feedback

Author:
Williame, Jerome  Accioly, Artur Difini  Rontani, Damien  Sciamanna, Marc  Kim, Joo-Von  


Journal:
APPLIED PHYSICS LETTERS


Issue Date:
2019


Abstract(summary):

A theoretical study of delayed feedback in spin-torque nano-oscillators is presented. The macrospin geometry is considered, where self-sustained oscillations are made possible by spin transfer torques associated with spin currents flowing perpendicular to the film plane. By tuning the delay and amplification of the self-injected signal, we identify dynamical regimes in this system such as chaos, switching between precession modes with complex transients, and oscillator death. Such delayed feedback schemes open up a field of exploration for such oscillators, where the complex transient states might find important applications in information processing.


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