Abstract
Room temperature data on the instability threshold (hcrit) at 9.4 GHz are reported on a series of polycrystalline LiTi ferrites with aluminium substitution. Parallel and perpendicular pumping instability threshold results are obtained by using a reflection type high power microwave spectrometer. The experimental results of instability threshold are reproduced theoretically by expressing spin-wave line-width as ΔHk = A + Ck + BΔHk(p, Ha). In this study the dependence of hcrit on magnetocrystalline anisotropy (Ha) and porosity (p) is studied by mathematical analysis. The theory provides good agreement with experimental data. Spin-wave linewidths calculated from the minimum value of hcrit(hcritmin) data show a moderate increase up to a certain aluminium concentration and thereafter, saturate for higher concentrations.
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