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

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• Direct-Current Induced Dynamics in Co90Fe10/Ni80Fe20 Point Contacts
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• Generation linewidth of an auto-oscillator with a nonlinear frequency shift: Spin-torque nano-oscillator
• Current-driven microwave oscillations in current perpendicular-to-plane spin-valve nanopillars
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• Stochastic theory of spin-transfer oscillator linewidths
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Cited by in corpus (32)

• Spectral Characteristics of the Microwave Emission by the Spin Hall Nano-Oscillator
• 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
• Non-linear spin-wave excitation at low bias fields
• Temperature dependence of nonlinear auto-oscillator linewidths: Application to spin-torque nano-oscillators
• Origin of the spectral linewidth in non linear oscillators based on MgO tunnel junctions
• Decoherence and mode-hopping in a magnetic tunnel junction-based spin-torque oscillator
• Non-white frequency noise in spin torque oscillators and its effect on spectral linewidth
• Spin-transfer-torque resonant switching and injection locking in presence of a weak external microwave field for spin valves with perpendicular materials
• Spin-torque oscillator linewidth narrowing under current modulation
• Direct experimental measurement of phase-amplitude coupling in spin torque oscillators
• Self-consistent calculation of spin transport and magnetization dynamics
• Measurement of nonlinear frequency shift coefficient in spin-torque oscillators based on MgO tunnel junctions
• Amplitude-Phase Coupling in a Spin-Torque Nano-Oscillator
• Relation between unidirectional spin Hall magnetoresistance and spin current-driven magnon generation
• Temperature dependence of linewidth in nano-contact based spin torque oscillators: effect of multiple oscillatory modes
• Auto-oscillation threshold, narrow spectral lines, and line jitter in spin-torque oscillators based on MgO magnetic tunnel junctions
• Time domain study of frequency-power correlation in spin-torque oscillators
• The Discrete Noise of Magnons
• Control of spectral characteristics of spin-current auto-oscillator by electric field
• Non-linear dynamics of the non-Hermitian Su-Schrieffer-Heeger model
• Auto-oscillation threshold and line narrowing in MgO-based spin-torque oscillators
• Spin-torque effects in thermally assisted magnetization reversal: Method of statistical moments
• Time Domain Mapping of Spin Torque Oscillator Effective Energy
• Planar approximation for the frequencies of spin transfer oscillators
• Effects of delayed feedback on the power spectrum of spin-torque nano-oscillators
• Detection of spin torque magnetization dynamics through low frequency noise
• Charge conservation in spin torque oscillators leads to a self-induced torque
• Switching based Spin Transfer Torque Oscillator with zero-bias field and large tuning-ratio
• Magnetic oscillations Excited by Concurrent Spin Injection from a Tunneling Current and a Spin Hall Current
• Power Spectral Density of Magnetization Dynamics Driven by a Jump-Noise Process
• Spin-transfer torque effects in the dynamic forced response of the magnetization of nanoscale ferromagnets in superimposed ac and dc bias fields in the presence of thermal agitation