  Spin transmission at ferromagnet/heavy metal interfaces is of vital
importance for many spintronic devices. Usually the spin current transmission
is limited by the spin mixing conductance and loss mechanisms such as spin
memory loss. In order to understand these effects, we study the interface
transmission when an insulating interlayer is inserted between the ferromagnet
and the heavy metal. For this we measure the inverse spin Hall voltage
generated from optically injected spin current pulses as well as the magnitude
of the spin pumping using ferromagnetic resonance. From our results we conclude
that significant spin memory loss only occurs for 5d metals with less than half
filled d-shell.

Mesoscale and Nanoscale Physics;Materials Science