Lineshape distortion in a nonlinear auto-oscillator near generation threshold: Application to spin-torque nano-oscillators

Abstract

The lineshape in an auto-oscillator with a large nonlinear frequency shift in the presence of thermal noise is calculated. Near the generation threshold, this lineshape becomes strongly non-Lorentzian, broadened, and asymmetric. A Lorentzian lineshape is recovered far below and far above threshold, which suggests that lineshape distortions provide a signature of the generation threshold. The theory developed adequately describes the observed behavior of a strongly nonlinear spin-torque nano-oscillator.

4 pages, 3 figures

References in corpus (3)

• Generation linewidth of an auto-oscillator with a nonlinear frequency shift: Spin-torque nano-oscillator
• Microwave power generated by a spin-torque oscillator in the presence of noise
• Thermally Assisted Current-Driven Bistable Precessional Regimes in Asymmetric Spin Valves

Cited by in corpus (4)

• Coupling efficiency for phase locking of a spin transfer oscillator to a microwave current
• Temperature dependence of nonlinear auto-oscillator linewidths: Application to spin-torque nano-oscillators
• Amplitude-Phase Coupling in a Spin-Torque Nano-Oscillator
• Auto-oscillation threshold and line narrowing in MgO-based spin-torque oscillators