We report energy renormalizations from electron-phonon and electron-magnon
interactions in spin minority surface resonances on Ni(111). The different
interactions are disentangled and quantified in strength λ, based on
the characteristic shapes of their complex self-energies, and the largely
different binding energies at which they occur. The observed electron-magnon
interactions reveal a strong dependence on momentum and energy band position in
the bulk Brillouin zone. In contrast, electron-phonon interactions from the
same bands are observed to be practically momentum- and symmetry-independent.
Additionally, a moderately strong (λ>0.5) electron-phonon interaction
is observed from a `buried', near-parabolic spin majority band that does not
cross the Fermi level.Comment: QuSpin 202