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Auto-oscillation thresholds at the main resonance in ferrimagnetic films
, Stancil D.
Published in American Physical Society
Volume: 57
Issue: 18
Pages: 11483 - 11491
The propagation of large-amplitude forward-volume magnetostatic waves (MSW’s) is studied in (Formula presented) and (Formula presented) thin films. The onset of auto-oscillations beyond the second Suhl instability influences the transmission characteristics of a MSW delay line. Global variations in transmitted power over a frequency-power input parameter space are monitored using density plots. There is a shift in the MSW passband with increasing input power that is explained by a decrease in demagnetizing field with an increase in dynamic magnetization. As the input power increases beyond a threshold value, we observe an increase in signal amplitude, heralding the onset of auto-oscillations. Fingers of auto-oscillation spanning an input range of 200 MHz and 10 dB are formed. The locations of these fingers are correlated with the locations of spin-wave resonance notches in the MSW passband. The auto-oscillation thresholds in the vicinity of a spin-wave resonance notch are 4-8 dB lower than elsewhere in the passband. A heuristic model based on a reduced group velocity near a notch can explain the lower threshold values. © 1998 The American Physical Society.
About the journal
JournalData powered by TypesetPhysical Review B - Condensed Matter and Materials Physics
PublisherData powered by TypesetAmerican Physical Society
Open AccessNo