The Onset of Auto-Oscillations of Parametrically Excited Spin-Wave Pairs.

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  • Mino Michinobu
    Department of Physics, Faculty of Science, Okayama University, Okayama 700–8530
  • Urakami Hisayuki
    Department of Physics, Faculty of Science, Okayama University, Okayama 700–8530
  • Safonov Vladimir L.
    Department of Physics, Faculty of Science, Okayama University, Okayama 700–8530
  • Zouta Keiichi
    Department of Physics, Faculty of Science, Okayama University, Okayama 700–8530
  • Yamazaki Hitoshi
    Department of Physics, Faculty of Science, Okayama University, Okayama 700–8530

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  • Onset of Auto-Oscillations of Parametri

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The parallel pumping of spin waves in an yttrium iron garnet (YIG)sphere placed in a microwave cavity has been performed by X-band microwaves. The onset and the principal frequencyof auto-oscillations above the threshold of spin-wave instabilitywere studied at various magnetic fields. We found anomalous field dependence of auto-oscillations frequency in the low field side of the butterfly curve, where the threshold of parallel pumping instability exhibits no anomaly.This result shows that the higher order nonlinear relaxation process ofparametrically excited magnons becomes important in a nonequilibrium system.

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