  The influence of hydrogen gas absorption by the Pd layer of bi-layered films
containing Pd and Co layers on the inverse Spin Hall Effect (iSHE) in the
material is measured. iSHE is driven by ferromagnetic resonance in the cobalt
layer. In these conditions, the iSHE is seen as a d.c. voltage across the Pd
layer. In the presence of hydrogen gas the iSHE peak shifts downwards in the
applied field together with the ferromagnetic resonance absorption peak for the
material. In parallel, an increase in the iSHE peak height and in its width is
observed. Our analysis suggests that these observations can potentially be
explained as a reduction in the spin Hall angle for the Palladium layer in the
presence of hydrogen gas.
