Using microwave network analyzer and MSW-SER to measure linewidth spectrum in magnetic garnet film from 0.5 to 20 GHz

A measurement technique, based on the combination of a modern network analyzer and wide-band-tunable magnetostatic wave straight-edge resonators (MSW-SERs), is used to automatically measure the linewidth ( Delta H) in yttrium iron garnet (YIG) epilayers at 0.5-20 GHz. Smith chart and voltage standing wave ratio methods are used to determine the half resonance band ( Delta omega ). Delta H value is calculated from Delta omega using resonance conditions of MSW-SERs. A system with insertion loss <0.07 dB and return <-50 dB is set up by an improved calibration. Four pieces of YIG films with thicknesses of 9-120 mu m and magnetization of 370-1750 Gs are examined in the range 0.5-20 GHz. The results measured at 9.2 GHz agree well with those obtained by ferromagnetic resonance.<
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