$CFMS/Pt$ bilayer samples. Angle dependent measurements of voltage were measured to quantify the various spin rectification effects. We observed a strong dependency of spin pumping voltage on the thickness of Pt. The spin pumping voltage was decreased when the thickness of Pt was increased, which may be due to increase in conductivity of Pt with thickness. The presence of substantial spin pumping keeps the damping constant values in the order of $\sim10^{-3}$. Spin mixing conductance ( *$g_{r}^{\uparrow \downarrow}$* ) was obtained to be 1.77 $\times 10^{20}$ $m^{-2}$, which was higher than those for the other reported FM/Pt systems. In addition, we observed highest spin interface transparency (84 $\%$) compared to any other FM/Pt system. Low magnetic damping and large value of *$g_{r}^{\uparrow \downarrow}$* with high interface transparency make the $CFMS/Pt$ system as a potential candidate for spintronic applications.

ACKNOWLEDGEMENT {#acknowledgement .unnumbered}
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The authors acknowledge DAE and DST, Govt. of India, for the financial support for the experimental facilities. KR thanks CSIR for JRF fellowship. SB acknowledges ICC-IMR fellowship to visit IMR, Tohoku University, for this collaborative work to prepare the thin films. BBS acknowledges DST for INSPIRE faculty fellowship.

REFERENCES {#references .unnumbered}
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