title: Spin-orbit hybridization points in the face-centered-cubic cobalt band structure.
abstract: Linear magnetic dichroism is observed in spin-, time-, and energy-resolved two-photon photoemission from valence bands of epitaxial fcc cobalt on Cu(001). With image-potential states as spectator states we identify initial bulk and surface states with minority spin character as the source for dichroic intensities and apparent dichroic lifetimes. Excellent agreement with ab initio fully relativistic calculations of the cobalt fcc band structure allows us to precisely determine spin-orbit hybridization points close to the Fermi level. These spin hot spots enhance spin-flip scattering by several orders of magnitude and are therefore assumed to be crucial in ultrafast demagnetization.
authors.affiliation: Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Strasse 10, 48149 Münster, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Pickel
authors.forename: A B
authors.initials: AB
authors.lastname: Schmidt
authors.forename: F
authors.initials: F
authors.lastname: Giesen
authors.forename: J
authors.initials: J
authors.lastname: Braun
authors.forename: J
authors.initials: J
authors.lastname: Minár
authors.forename: H
authors.initials: H
authors.lastname: Ebert
authors.forename: M
authors.initials: M
authors.lastname: Donath
authors.forename: M
authors.initials: M
authors.lastname: Weinelt