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Ferromagnetic materials exhibiting low magnetic damping ($\alpha$) andmoderately high saturation magnetization are required from the viewpoints ofgeneration, transmission and detection of spin wave. Since spin-to-chargeconversion efficiency is another important parameter, high spin mixingconductance ($g_{r}^{\uparrow \downarrow}$) is the key for efficientspin-to-charge conversion. Full Heusler alloys e.g. $Co_2Fe_{0.4}Mn_{0.6}Si$(CFMS), which are predicted to be 100$\%$ spin polarized, possess low $\alpha$.However, the $g_{r}^{\uparrow \downarrow}$ at the interface between CFMS and aparamagnet has not fully been understood. Here, we report the investigations ofspin pumping and inverse spin Hall effect in $CFMS/Pt$ bilayers. Dampinganalysis indicates the presence of significant spin pumping at the interface ofCFMS and Pt, which is also confirmed by the detection of inverse spin Hallvoltage. We show that in CFMS/Pt the $g_{r}^{\uparrow \downarrow}$(1.77$\times$10$^{20}$m$^{-2}$) and interface transparency (84$\%$) are highercompared to values reported for other ferromagnet/heavy metal systems.

High spin mixing conductance and spin interface transparency at $Co_2Fe_{0.4}Mn_{0.6}Si$ Heusler alloy and Pt interface