  A `toy model' - aimed at capturing the essential physics - is presented that
jointly describes spin-polarized hot electron transport and spin pumping driven
by local heating. These two processes both contribute to spin-current
generation in laser-excited magnetic heterostructures. The model is used to
compare the two contributions directly. The spin-polarized hot electron current
is modeled as one generation of hot electrons with a spin-dependent excitation
and relaxation scheme. Upon decay, the excess energy of the hot electrons is
transferred to a thermalized electron bath. The elevated electron temperature
leads to an increased rate of electron-magnon scattering processes and yields a
local accumulation of spin. This process is dubbed as spin pumping by local
heating. The built-up spin accumulation is effectively driven out of the
ferromagnetic system by (interfacial) electron transport. Within our model, the
injected spin current is dominated by the contribution resulting from spin
pumping, while the hot electron spin current remains relatively small. We
derive that this observation is related to the ratio between the Fermi
temperature and Curie temperature, and we show what other fundamental
parameters play a role.
