Non-Adlerian phase slip and non stationary synchronization of spin-torque oscillators to a microwave source

Abstract

The non-autonomous dynamics of spin-torque oscillators in presence of both microwave current and field at the same frequency can exhibit complex non-isochronous effects. A non-stationary mode hopping between quasi-periodic mode (frequency pulling) and periodic mode (phase locking), and a deterministic phase slip characterized by an oscillatory synchronization transient (non-Adlerian phase slip) after the phase jump of have been predicted. In the latter effect, a wavelet based analysis reveals that in the positive and negative phase jump the synchronization transient occurs at the frequency of the higher and lower sideband frequency respectively. The non-Adlerian phase slip effect, even if discovered in STOs, is a general property of non-autonomous behavior valid to any non-isochronous auto-oscillator in regime of moderate and large force locking.

12 page, 4 figures

References in corpus (4)

• Bias-driven large power microwave emission from MgO-based tunnel magnetoresistance devices
• Coupling efficiency for phase locking of a spin transfer oscillator to a microwave current
• Large-amplitude coherent spin waves exited by spin-polarized current in nanoscale spin valves
• Non-stationary magnetization dynamics driven by spin transfer torque

Cited by in corpus (9)

• Spin transfer nano-oscillators
• Giant spin-torque diode sensitivity at low input power in the absence of bias magnetic field
• Understanding of phase noise squeezing under fractional synchronization of non-linear spin transfer vortex oscillator
• Optimizing magneto-dipolar interactions for synchronizing vortex based spin-torque nano-oscillators
• Synchronization and chaos in a spin-torque oscillator with a perpendicularly magnetized free layer
• Injection locking at zero field in two free layer spin-valves
• Impact of intra-grain spin wave reflections on nano-contact spin torque oscillators
• Frequency locking near the gluing bifurcation: Spin-torque oscillator under periodic modulation of current
• Phase estimation of spin-torque oscillator by nonlinear spin-torque diode effect