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In contrast to the long-known fact that spin-flip hot spots, i.e., special\vc{k}-points on the Fermi surface showing a high spin-mixing parameter, do notoccur in the bulk of monovalent (noble and alkali) metals, we found them on thesurface Brillouin-zone boundary of ultrathin films of these metals.Density-functional calculations within the Korringa-Kohn-Rostoker Greenfunction method for ultrathin (001) oriented Cu, Ag, and Au films of 10-layerthickness show that the region around the hot spots can have a substantialcontribution, e.g.\ 52\% in Au(001), to the integrated spin-mixing parameter,that could lead to a significant enhancement of the spin-relaxation rate orspin-Hall angle in thin films. Owing to the appearance of spin-flip hot-spots,a large anisotropy of the Elliott-Yafet parameter [50\% for Au(001)] is alsofound in these systems. The findings are important for spintronics applicationsin which noble-metals are frequently used and in which the dimensionality ofthe sample is reduced.

Spin-flip hot spots in ultrathin films of monovalent metals: Enhancement and anisotropy of the Elliott-Yafet parameter