title: Femtosecond electron and spin dynamics in Gd(0001) studied by time-resolved photoemission and magneto-optics.
abstract: Femtosecond electron and spin dynamics of the Gd(0001) surface are investigated by time-resolved photoemission and second harmonic generation. Upon optical excitation the spin polarization of the surface state is reduced by half while its exchange splitting remains nearly unchanged. Electron-magnon interaction is proposed to facilitate electron-spin-flip scattering among spin-mixed surface and bulk states, which provides a mechanism for ultrafast demagnetization.
authors.affiliation: Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin-Dahlem, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Lisowski
authors.forename: P A
authors.initials: PA
authors.lastname: Loukakos
authors.forename: A
authors.initials: A
authors.lastname: Melnikov
authors.forename: I
authors.initials: I
authors.lastname: Radu
authors.forename: L
authors.initials: L
authors.lastname: Ungureanu
authors.forename: M
authors.initials: M
authors.lastname: Wolf
authors.forename: U
authors.initials: U
authors.lastname: Bovensiepen