Coakley, K.
, Kabos, P.
and Johnson, S.
(2021),
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 9, 2025)
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Determination ofeffective magnetizationand gyromagnetic ratio ofyttrium iron garnetfrom multi-modeferromagnetic resonanceS21 spectra
Published
Author(s)
, , Scooter D. Johnson
Abstract
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.Citation
IEEE Transactions on Magnetics
Volume
57
Issue
5
Pub Type
Journals
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Keywords
effective magnetization, empirical modeling, ferromagnetic resonance spectra, statistical modeling
Citation
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Created April 27, 2021