Platinum thickness dependence of the inverse spin-Hall voltage from spin   pumping in a hybrid YIG/Pt system
  We show the first experimental observation of the platinum (Pt) thickness dependence in a hybrid YIG/Pt system of the inverse spin-Hall effect from spin pumping, over a large frequency range and for different rf powers. From the measurement of the dc voltage ($\Delta\textrm{V}$) at the resonant condition and the resistance ($R$) of the Pt layer, a strong enhancement of the ratio $\Delta\textrm{V}/R$ has been observed, which is not in agreement with previous studies on the NiFe/Pt system. The origin of this behaviour is still unclear and cannot be explained by the spin transport model that we have used. 
Vincent Castel, Nynke Vlietstra, Jamal Ben Youssef, and Bart J. van   Wees
cond-mat.mes-hall cond-mat.mtrl-sci