Femtosecond electron and spin dynamics in Gd(0001) studied by time-resolved photoemission and magneto-optics.
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.
Lisowski
M
M
Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin-Dahlem, Germany.
Loukakos
P A
PA
Melnikov
A
A
Radu
I
I
Ungureanu
L
L
Wolf
M
M
Bovensiepen
U
U