Origin of the spectral linewidth in non linear oscillators based on MgO tunnel junctions

Abstract

We demonstrate the strong impact of the oscillator agility on the line broadening by studying spin transfer induced microwave emission in MgO-based tunnel junctions with current. The linewidth is almost not affected by decreasing the temperature. At very low currents, a strong enhancement of the linewidth at low temperature is attributed to an increase of the non linearity, probably due to the field-like torque. Finally we evidence that the noise is not dominated by thermal fluctuations but rather by the chaotization of the magnetization system induced by the spin transfer torque.

arXiv comment12 pages, 3 figures, published in Phys. Rev. B 80, 060404 (2009)

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• Decoherence and mode-hopping in a magnetic tunnel junction-based spin-torque oscillator
• Bias dependence of perpendicular spin torque and of free and fixed layer eigenmodes in MgO-based nanopillars
• Spin-torque oscillator linewidth narrowing under current modulation
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• Temperature dependence of linewidth in nano-contact based spin torque oscillators: effect of multiple oscillatory modes
• Temperature dependence of microwave voltage emission associated to spin-transfer induced vortex oscillation in magnetic tunnel junction
• Temperature dependence of the emission linewidth in MgO-based spin torque nano-oscillators
• Super-harmonic injection locking of nano-contact spin-torque vortex oscillators
• Low offset frequency $1/f$ flicker noise in spin torque vortex oscillators
• A Quantum Approach of Meso-Magnet Dynamics with Spin Transfer Torque
• Time Domain Mapping of Spin Torque Oscillator Effective Energy
• A quasi-linear spin-torque nano-oscillator via enhanced negative feedback of power fluctuations
• Frequency converter based on nanoscale MgO magnetic tunnel junctions
• Optimization of the current pulse for spin-torque switches
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