Chaos in nanomagnet via feedback current
arXiv:1909.05315 · doi:10.1103/PhysRevB.100.174425
Abstract
Nonlinear magnetization dynamics excited by spin-transfer effect with feedback current is studied both numerically and analytically. The numerical simulation of the Landau-Lifshitz-Gilbert equation indicates the positive Lyapunov exponent for a certain range of the feedback rate, which identifies the existence of chaos in a nanostructured ferromagnet. Transient behavior from chaotic to steady oscillation is also observed in another range of the feedback parameter. An analytical theory is also developed, which indicates the appearance of multiple attractors in a phase space due to the feedback current. An instantaneous imbalance between the spin-transfer torque and damping torque causes a transition between the attractors, and results in the complex dynamics.
References in corpus (17)
- Microwave Oscillations of a Nanomagnet Driven by a Spin-Polarized Current
- Current-driven Magnetization Reversal and Spin Wave Excitations in Co/Cu/Co Pillars
- Spin Transfer Torques
- Theory of Current-Driven Domain Wall Motion: A Poorman's Approach
- Direct-Current Induced Dynamics in Co90Fe10/Ni80Fe20 Point Contacts
- Magnetic Vortex Core Dynamics in a Ferromagnetic Dot
- Field dependence of magnetization reversal by spin transfer
- Generation linewidth of an auto-oscillator with a nonlinear frequency shift: Spin-torque nano-oscillator
- Macromagnetic simulation for reservoir computing utilizing spin dynamics in magnetic tunnel junctions
- Chaotic Dynamics of Spin-Valve Oscillators
- Instability analysis of spin torque oscillator with an in-plane magnetized free layer and a perpendicularly magnetized pinned layer
- Synchronized, periodic, and chaotic dynamics in spin torque oscillator with two free layers
- Relaxation time and critical slowing down of a spin-torque oscillator
- Synchronized Magnetization Oscillations in F/N/F Nanopillars
- Dynamic coupling of ferromagnets via spin Hall magnetoresistance
- Phase dynamics of oscillating magnetizations coupled via spin pumping
- Spin-current driven spontaneous coupling of ferromagnets
Cited by in corpus (15)
- Physical reservoir computing -- An introductory perspective
- Reservoir computing using a spin-wave delay line active ring resonator
- Designing spontaneous behavioral switching via chaotic itinerancy
- Reconfigurable Reservoir Computing in a Magnetic Metamaterial
- Periodic structure of memory function in spintronics reservoir with feedback current
- Computational capability for physical reservoir computing using a spin-torque oscillator with two free layers
- Bifurcation structure and chaos in nanomagnet coupled to Josephson junction
- Input-driven chaotic dynamics in vortex spin-torque oscillator
- A magnetic domain wall Mackey-Glass oscillator
- Chaotic magnetization dynamics in magnetic Duffing oscillator
- Bifurcation to complex dynamics in largely modulated voltage-controlled parametric oscillator
- Effects of delayed feedback on the power spectrum of spin-torque nano-oscillators
- Chaotic magnetization dynamics driven by feedback magnetic field
- Chaotic spin precession in antiferromagnetic domain walls
- Feedback voltage driven chaos in a three-terminal spin-torque oscillator