  A joint theoretical and experimental investigation is performed to understand
the underlying physics of laser-induced demagnetization in Ni and Co films.
Experimentally dynamics of spins is studied by determining the time-dependent
amplitude of the Voigt vector and theoretically ab-initio calculations are
performed using time-dependent density functional theory. We demonstrate that
overall spin-orbit induced spin-flips are the most significant contributors
with super-diffusive spin transport playing very limited to no role. Our study
highlights the material dependent nature of the demagnetization during the
process of thermalization of non-equilibrium spins.
