Low relaxation rate in a low-Z alloy of iron

Details Low relaxation rate in a low-Z alloy of iron Low relaxation rate in a low-Z alloy of iron

2006-12-30

arxiv.org/abs/cond-mat/0701004v1

Phys. Rev. Lett. 98(11) 117601 (2007)

Physics

Condensed Matter

Materials Science

14 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.98.117601

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

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