Direct experimental measurement of phase-amplitude coupling in spin torque oscillators

Abstract

We study spin-torque induced oscillations of MgO magnetic tunnel junctions in the time domain. By using the Hilbert transform on the time traces, we obtain for the first time a direct experimental measure of the coupling between the power and the phase fluctuations. We deduce the power restoration rate and we obtain low values for the coupling strength, which is consistent with the weak frequency dependence on the applied voltage.

3 pages, 3 figures

References in corpus (8)

• Generation linewidth of an auto-oscillator with a nonlinear frequency shift: Spin-torque nano-oscillator
• Lineshape distortion in a nonlinear auto-oscillator near generation threshold: Application to spin-torque nano-oscillators
• Time domain measurement of phase noise in a spin torque oscillator
• Microwave power generated by a spin-torque oscillator in the presence of noise
• Temperature dependence of nonlinear auto-oscillator linewidths: Application to spin-torque nano-oscillators
• Stochastic theory of spin-transfer oscillator linewidths
• Measurement of nonlinear frequency shift coefficient in spin-torque oscillators based on MgO tunnel junctions
• Auto-oscillation threshold and line narrowing in MgO-based spin-torque oscillators

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• Experimental demonstration of a rapid sweep-tuned spectrum analyzer with temporal resolution based on a spin-torque nano-oscillator
• Spin-torque oscillator linewidth narrowing under current modulation
• Frequency shift keying by current modulation in a MTJ-based STNO with high data rate
• Nonlinear behavior and mode coupling in spin transfer nano-oscillators
• Temperature dependence of the emission linewidth in MgO-based spin torque nano-oscillators
• Low offset frequency $1/f$ flicker noise in spin torque vortex oscillators
• Time-domain stability of parametric synchronization in a spin-torque nano-oscillator based on a magnetic tunnel junction
• A quasi-linear spin-torque nano-oscillator via enhanced negative feedback of power fluctuations
• Effects of delayed feedback on the power spectrum of spin-torque nano-oscillators
• Flicker and random telegraph noise between gyrotropic and dynamic C-state of a vortex based spin torque nano oscillator
• Low-non-linearity spin-torque oscillations driven by ferromagnetic nanocontacts
• Geometric phase-control of a spin-torque oscillator