Measured and Calculated Ultrafast Changes of the Helicity Dependent Absorption at the Co Resonance (IMAGE)

Forschungsverbund Berlin

Measured and Calculated Ultrafast Changes of the Helicity Dependent Absorption at the Co Resonance

Caption

Measured (a) and calculated (b) ultrafast changes of the helicity dependent absorption at the Co resonance at a photon energy of 60.3 eV for a Co film (yellow) and a CoPt alloy (blue). Right circularly polarized radiation probes predominantly the relative changes in the occupations of spin-down electrons. Reduction of absorption is consequently a direct measure of an ultrafast and efficient filling of unoccupied spin-down states of Co. This filling occurs via optically transferred spin-down electrons originating from Pt.

Credit

MBI Berlin

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