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.
Chaotic dynamics in a macrospin spin-torque nano-oscillator with delayed feedback
Jérôme Williame, Artur Difini Accioly, Damien Rontani, Marc Sciamanna, Joo-Von Kim; Chaotic dynamics in a macrospin spin-torque nano-oscillator with delayed feedback. Appl. Phys. Lett. 10 June 2019; 114 (23): 232405. https://doi.org/10.1063/1.5095630
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