  The spin-to-charge conversion phenomena is investigated in a trilayer
structure consisting of Co(12 nm)/Sb(t)/Py(12 nm), where the thickness t of the
antimony layer is varied. Using the spin-pumping technique, a pure spin current
is injected from both FM layers into the middle layer, the DC voltage is then
measured. We observe a spin-to-charge mechanism in the Sb layer that exhibits
striking similarities to the inverse Rashba-Edelstein effect (IREE), driven by
surface states.
