Abstract
High-power ferromagnetic resonance (FMR) in thin YIG disks produces finger-like regions of auto-oscillation as a function of static field and excitation power. These fingers are associated with the magnetostatic modes found in the low-power FMR spectra and are characterized by their onset power (2–15 dBm) and frequency (1–10 MHz). Using a 9.23 GHz excitation source, the temperature dependence of these characteristics has been investigated from 130 to 290 K. It has been found that as the temperature decreases both the onset power and the auto-oscillation frequency increase. This is consistent with the known increase in sample magnetization and the observed increase in both linewidth and mode spacing as the temperature of the sample is lowered. Numerical results have been obtained from a model based upon a microscopic Hamiltonian and are in excellent agreement with the experimental data.
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