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Phys Rev Lett. 2003 Jun 20;90(24):247201. Epub 2003 Jun 17.

Femtosecond electron and spin dynamics in Ni/W(110) films.

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Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany.


The collapse of the magnetic exchange splitting in 7 monolayer thick epitaxial Ni/W(110) films following a femtosecond laser pulse was measured using time-resolved photoemission spectroscopy. Ultrafast demagnetization during the laser induced hot electron cascade proceeds via spin-flip excitations with a relaxation time constant of 300+/-70 fs. At longer times the electronic system cools down and the magnetization is finally reestablished with a time constant of 3.2+/-0.2 ps.

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