  We report energy renormalizations from electron-phonon and electron-magnon
interactions in spin minority surface resonances on Ni(111). The different
interactions are identified, disentangled, and quantified from the
characteristic signatures they provide to the complex self-energy and the
largely different binding energies at which they occur. The observed
electron-magnon interactions exhibit a strong dependence on momentum and energy
band position in the bulk Brillouin zone. In contrast, electron-phonon
interactions from the same bands appear to be relatively momentum- and
symmetry-independent. Additionally, a moderately strong ($\lambda>0.5$)
electron-phonon interaction is distinguished from a near-parabolic spin
majority band not crossing the Fermi level.
