Abstract
Development of low-loss microwave ferrite material (gadolinium-substituted yttrium iron garnet) for high-power microwave device is reported from the studies of spin-wave instability threshold (hcrit) in parallel and perpendicular pumping configurations at 9.4 GHz and room temperature. Room-temperature ferromagnetic resonance linewidth (ΔH) and spin wave linewidth (ΔHk) show marked effect with various Gd3+ substitution. The experimental instability threshold results show strong variation with Gd3+ substitution. Parallel pump experimental butterfly curves are reproduced theoretically from our revised pore-scattering model, taking into account the k dependence of spin-wave linewidth from a trial function ΔHk = A + BΔHk(p) + Ck, whereas the perpendicular pump butterfly curves are reproduced from a sin θk function in conjunction with the k dependence of spin-wave linewidth similar to Patton's model.
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