Enhanced Inverse Spin-Hall Effect in Ultrathin Ferromagnetic/Normal   Metal Bilayers
  We measure electrically detected ferromagnetic resonance in microdevices patterned from ultra-thin Co/Pt bilayers. Spin pumping and rectification voltages are observed and distinguished via their angular dependence. The spin-pumping voltage shows an unexpected increase as the cobalt thickness is reduced below 2 nm. This enhancement allows more efficient conversion of spin to charge current and motivates a theory modelling the dependence of impurity scattering on surface roughness. 
T. D. Skinner, H. Kurebayashi, D. Fang, D. Heiss, A. C. Irvine, A. T.   Hindmarch, M. Wang, A. W. Rushforth, A. J. Ferguson
cond-mat.mes-hall