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