Abstract
We have measured the ferromagnetic resonance (FMR) frequency and field linewidths of thin epitaxial Fe films (grown using molecular beam epitaxy) using network-analyzer FMR and conventional FMR. From the linewidths, we determined quantitatively the intrinsic and extrinsic contribution to the Gilbert damping. The observed broadening of the linewidth for thinner Fe films is consistent with the two-magnon scattering mechanism proposed by Arias and Mills. The decrease of the linewidth as a function of film thickness is fit to a power law. This fit allows a determination of the intrinsic contribution to the linewidth. We find a frequency width=0.147 GHz and field linewidth=47 Oe.
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