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We investigate spin pumping phenomena in polycrystalline CoFeB/Pt andCoFeB/Ta bilayers and the correlation between the effective spin mixingconductance $g^{\uparrow\downarrow}_{\rm eff}$ and the obtained voltagesgenerated by the spin-to-charge current conversion via the inverse spin Halleffect in the Pt and Ta layers. For this purpose we measure the in-planeangular dependence of the generated voltages on the external static magneticfield and we apply a model to separate the spin pumping signal from the onegenerated by the spin rectification effect in the magnetic layer. Our resultsreveal a dominating role of anomalous Hall effect for the spin rectificationeffect with CoFeB and a lack of correlation between$g^{\uparrow\downarrow}_{\rm eff}$ and inverse spin Hall voltages pointing to astrong role of the magnetic proximity effect in Pt in understanding theobserved increased damping. This is additionally reflected on the presence of alinear dependency of the Gilbert damping parameter on the Pt thickness.

Lack of correlation between the spin mixing conductance and the ISHE-generated voltages in CoFeB/Pt,Ta bilayers