Published in
American Physical Society, Physical Review Letters, 16(100)
DOI: 10.1103/physrevlett.100.167201
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Line Shape Distortion in a Nonlinear Auto-Oscillator Near Generation Threshold: Application to Spin-Torque Nano-Oscillators
,
Joo Von Kim,
Q. Mistral,
C. Chappert,
V. S. Tiberkevich,
A. N. Slavin
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Abstract
The power spectrum of an auto-oscillator with a large frequency nonlinearity in a noisy environment is calculated. The power spectrum becomes strongly non-Lorentzian, broadened, and asymmetric near the generation threshold. A Lorentzian spectrum is recovered far below and far above the threshold, which suggests that line shape distortions provide a signature of the threshold. We show that the developed theory adequately describes the observed behavior of a strongly nonlinear spin-torque nano-oscillator.