Origin of the spectral linewidth in nonlinear spin-transfer oscillators based on MgO tunnel junctions

@inproceedings{Georges2009OriginOT,
  title={Origin of the spectral linewidth in nonlinear spin-transfer oscillators based on MgO tunnel junctions},
  author={Blahoua Kassi Georges and Julie Grollier and Vincent Cros and Albert Fert and Akio Fukushima and Hitoshi Kubota and K. Yakushijin and Shinji Yuasa and Kōzō Andō},
  year={2009}
}
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… CONTINUE READING

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