Determination ofeffective magnetizationand gyromagnetic ratio ofyttrium iron garnetfrom multi-modeferromagnetic resonanceS21 spectra
Kevin Coakley, Pavel Kabos, Scooter D. Johnson
We acquire ferromagnetic resonance spectra for an out-of-plane magnetized yttrium iron garnet sample with a vector network analyzer at microwave frequencies ranging from 4.2 GHz to 5.2 GHz. The applied static magnetic field varies from approximately 253.6 kA/m to 260.1 kA/m. Based on an empirical model for resonant features in the S21 spectrum produced by the excitation of multiple modes and instrumental effects, we predict measured values of $S_21}$ parameters. For each of many microwave frequencies, for each of multiple modes, we determine the resonant field value of the applied magnetic field, an amplitude and a ferromagnetic resonance line width. Based on the frequency-dependent resonant field values produced by excitation of the main mode, we determine the effective magnetization and the gyromagnetic ratio of the sample.
, Kabos, P.
and Johnson, S.
Determination ofeffective magnetizationand gyromagnetic ratio ofyttrium iron garnetfrom multi-modeferromagnetic resonanceS21 spectra, IEEE Transactions on Magnetics, [online], https://dx.doi.org/10.1109/TMAG.2021.3065758, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=930988
(Accessed October 22, 2021)