Synchronization and chaos in a spin-torque oscillator with a perpendicularly magnetized free layer
arXiv:1912.11179 · doi:10.1103/PhysRevB.100.224422
Abstract
Synchronization and chaos caused by alternating current and microwave field in a spin torque oscillator consisting of a perpendicularly magnetized free layer and an in-plane magnetized reference layer is comprehensively studied theoretically. A forced synchronization by the alternating current is observed in numerical simulation over wide ranges of its amplitude and frequency. An analytical theory clarifies that the nonlinear frequency shift, as well as the spin-transfer torque asymmetry, plays a key role in determining locking range and phase difference between the oscillator and current. Chaos caused by the alternating current is identified for a region of large alternating current by evaluating the Lyapunov exponent. Similar results are also obtained for microwave field, although the parameter regions causing chaos are narrower than those by the alternating current.
References in corpus (22)
- Microwave Oscillations of a Nanomagnet Driven by a Spin-Polarized Current
- Current-driven Magnetization Reversal and Spin Wave Excitations in Co/Cu/Co Pillars
- Theory of Current-Driven Domain Wall Motion: A Poorman's Approach
- Direct-Current Induced Dynamics in Co90Fe10/Ni80Fe20 Point Contacts
- Spin torque building blocks
- Vowel recognition with four coupled spin-torque nano-oscillators
- Currents, Torques, and Polarization Factors in Magnetic Tunnel Junctions
- Anomalous Bias Dependence of Spin Torque in Magnetic Tunnel Junctions
- Spin-transport in multi-terminal normal metal - ferromagnet systems with non-collinear magnetizations
- Boltzmann Test of Slonczewski's Theory of Spin Transfer Torque
- Spin Transfer Dynamics in Spin Valves with Out-of-plane Magnetized CoNi Free Layers
- Coupling efficiency for phase locking of a spin transfer oscillator to a microwave current
- Macromagnetic simulation for reservoir computing utilizing spin dynamics in magnetic tunnel junctions
- Non-collinear spin transfer in Co/Cu/Co multilayers
- Reservoir computing with the frequency, phase and amplitude of spin-torque nano-oscillators
- Spin-transfer in diffusive ferromagnet-normal metal systems with spin-flip scattering
- Chaotic Dynamics of Spin-Valve Oscillators
- Parametric excitation of a magnetic nanocontact by a microwave field
- Critical Field of Spin Torque Oscillator with Perpendicularly Magnetized Free Layer
- Parallel pumping of magnetic vortex gyrations in spin-torque nano-oscillators
- Non-Adlerian phase slip and non stationary synchronization of spin-torque oscillators to a microwave source
- Relaxation time and critical slowing down of a spin-torque oscillator
Cited by in corpus (12)
- Physical reservoir computing -- An introductory perspective
- Designing spontaneous behavioral switching via chaotic itinerancy
- Computational capability for physical reservoir computing using a spin-torque oscillator with two free layers
- Input-driven chaotic dynamics in vortex spin-torque oscillator
- Field-free high-frequency exchange-spring spin-torque nano-oscillators
- Direct observation of current-induced nonlinear spin torque in Pt-Py bilayers
- Chaotic magnetization dynamics in magnetic Duffing oscillator
- Bifurcation to complex dynamics in largely modulated voltage-controlled parametric oscillator
- 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
- Phase estimation of spin-torque oscillator by nonlinear spin-torque diode effect