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The longest relaxation time and sharpest frequency content in ferromagneticprecession is determined by the intrinsic (Gilbert) relaxation rate \emph{$G$}.For many years, pure iron (Fe) has had the lowest known value of $G=\textrm{57Mhz}$ for all pure ferromagnetic metals or binary alloys. We show that anepitaxial iron alloy with vanadium (V) possesses values of $G$ which aresignificantly reduced, to 35$\pm$5 Mhz at 27% V. The result can be understoodas the role of spin-orbit coupling in generating relaxation, reduced throughthe atomic number $Z$.Comment: 14 pages, 4 figure

Low Relaxation Rate in Epitaxial Vanadium-Doped Ultrathin Iron Films