Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Determination ofeffective magnetizationand gyromagnetic ratio ofyttrium iron garnetfrom multi-modeferromagnetic resonanceS21 spectra

Published

Author(s)

Kevin Coakley, Pavel Kabos, 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

Keywords

effective magnetization, empirical modeling, ferromagnetic resonance spectra, statistical modeling

Citation

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 22, 2021)
Created April 27, 2021