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 wideband-tunable magnetostatic wave straight-edge resonators (MSW-SER), is taken to automatically measure the linewidth (?H) in yttrium ion garnet (YIG) epilayers at 0. 5-20 GHz. Smith chart and voltage standing wave ratio method are used to determine the half resonance band (??). ?H value is calculated from ?? using resonance conditions of MSW-SERs. A system with insertion loss <0.07 dB and return < - 50dB is set up by an improved calibration. Four pieces of YIG films with thickness 9-120?m and magnetization 370-1750 Gs are examined in 0.5-20 GHz. The results measured at 9. 2 GHz agree well with those obtained by ferromagnetic resonance.