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Ultrafast electron thermalization in a magnetic layered Au/Co/Au film
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View: Figures


Image of FIG. 1.
FIG. 1.

Transmission (open circles), reflection (black squares), and absorption (stars) of a layered structure consisting of a 28 nm thick gold buffer layer, 6 MLs of cobalt, and 15 MLs of gold on a glass substrate, computed from the effective medium model using dielectric constants from Refs. 16, 17, and 19. Light scattering has been neglected. Full red line: experimental reflection and transmission coefficients normalized to the values computed at 2.35 eV.

Image of FIG. 2.
FIG. 2.

Transient changes in reflection (left side) and transmission (right side) of a layered Au/Co/Au film (black squares) and of a 30 nm thick reference Au film (open blue circles) for several probe energies. The pump photon energy is kept at 1.55 eV. The dashed line is the pump-probe cross correlation.

Image of FIG. 3.
FIG. 3.

Logarithm of the transient change in transmission of a layered Au/Co/Au film (black squares) and a reference gold film (open circles). The thermal background has been subtracted. The solid lines are monoexponential fits to the data.

Image of FIG. 4.
FIG. 4.

External (electron-phonon) scattering rate as a function of the cobalt layer thickness (black squares). Scattering rate in the reference gold film (open circle). The solid line is a linear fit to the data.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ultrafast electron thermalization in a magnetic layered Au/Co/Au film