title: Ultrafast demagnetization by hot electrons: Diffusion or super-diffusion?
abstract: Ultrafast demagnetization of ferromagnetic metals can be achieved by a heat pulse propagating in the electron gas of a non-magnetic metal layer, which absorbs a pump laser pulse. Demagnetization by electronic heating is investigated on samples with different thicknesses of the absorber layer on nickel. This allows us to separate the contribution of thermalized hot electrons compared to non-thermal electrons. An analytical model describes the demagnetization amplitude as a function of the absorber thickness. The observed change of demagnetization time can be reproduced by diffusive heat transport through the absorber layer.
authors: Laboratory for Solid State Physics , ETH Zurich, 8093 Zurich, Switzerland.
authors: G
authors: G
authors: Salvatella
authors: Laboratory for Solid State Physics , ETH Zurich, 8093 Zurich, Switzerland.
authors: R
authors: R
authors: Gort
authors: Laboratory for Solid State Physics , ETH Zurich, 8093 Zurich, Switzerland.
authors: K
authors: K
authors: Bühlmann
authors: Laboratory for Solid State Physics , ETH Zurich, 8093 Zurich, Switzerland.
authors: S
authors: S
authors: Däster
authors: Laboratory for Solid State Physics , ETH Zurich, 8093 Zurich, Switzerland.
authors: A
authors: A
authors: Vaterlaus
authors: Laboratory for Solid State Physics , ETH Zurich, 8093 Zurich, Switzerland.
authors: Y
authors: Y
authors: Acremann