  We propose a semi-classical model for femtosecond-laser induced
demagnetization due to spin-polarized excited electron diffusion in the
super-diffusive regime. Our approach treats the finite elapsed time and
transport in space between multiple electronic collisions exactly, as well as
the presence of several metal films in the sample. Solving the derived
transport equation numerically we show that this mechanism accounts for the
experimentally observed demagnetization within 200fs in Ni, without the need to
invoke any angular momentum dissipation channel.
