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The phenomenon of ferromagnetic resonance (FMR) is still being exploited fordetermining the magnetocrystalline anisotropy constants of magnetic materials.We show that one can also determine accurately the saturation magnetization ofthe sample using results of FMR experiments after taking into account therelationship between resonance frequency and curvature of the spatialdistribution of free energy at resonance. Specifically, three examples aregiven of calculating saturation magnetization from FMR data: we use historicalBickford's measurements from 1950 for bulk magnetite, Liu's measurements from2007 for a 500 mn thin film of a weak ferromagnet (Ga, Mn)As, and Wang'smeasurements from 2014 for an ultrathin film of YIG. In all three cases, themagnetization values we have determined are consistent with the results ofmeasurements.

How to accurately determine a saturation magnetization of the sample in a ferromagnetic resonance experiment?