Femtosecond transient reflectivities of Co/Cu and Ag/Cu multilayer films were measured to study the electron-lattice relaxation in these systems. The measurement results suggest that the thickness of Cu layers does not influence the electron relaxation time. A slow decaying signal, which is absent in Ag/Cu films, was observed in Co/Cu films and it is attributed to the spin excitations in the Co layers.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)