$\alpha$ due to spin pumping, the thickness of CFMS layer, Bohr magneton, Lande g- factor (2.1), respectively. In order to calculate the real part of spin mixing conductance *$g_{\it{r}}^{\uparrow \downarrow}$*, we used the model which considered the spin memory loss (SML) mainly due to the interfacial roughness and disorder \[44\]. In this model effective spin mixing conductance is given by the following equation \[44\]:

$$\label{q12}
 g_{\it{eff}}^{\uparrow \downarrow}=
 \frac{r_{sl}cosh(\delta)+r_{sN}^{\infty}coth(\frac{t_{Pt}}{\lambda_{Pt}})sinh(\delta)}{r_{sl}[1+0.5\sqrt{\frac{3}{\epsilon}}coth(\frac{t_{Pt}}{\lambda_{Pt}}]cosh(\delta)+[r_{sN}^{\infty}coth(\frac{t_{Pt}}{\lambda_{Pt}})+0.5\frac{r_{sl}^{2}}{r_{sN}^{\infty}}\sqrt{\frac{3}{\epsilon}}]sinh(\delta)}$$

where $\epsilon$ is the ratio of the spin conserved to spin flip relaxation times. According to \[25\], we set $\epsilon$ = 0.1 for the present Pt. *$r_{sI}$*, *$r_{sN}^{\infty}$*, *$\delta$,$\lambda_{Pt}$* are the interfacial spin resistance, the Pt spin resistance, the spin flip parameter for the CFMS/Pt interface, and the spin diffusion length in Pt, respectively. Fig. \[fig6\] shows the fitting (solid line) of the data of *$g_{eff}^{\uparrow \downarrow}$* using Eq. \[q12\]. The fitting gives the values of *$\lambda_{Pt}$* = 7.5 $\pm$ 0.5 nm, *$g_{r}^{\uparrow \downarrow}$*= 1.77 $\pm$ 0.03 $\pm$ $10^{20}$ $m^{-2}$, and $\delta$ = 0.1. The values of *$r_{sI}$* and *$r_{sN}^{\infty}$* values are found to be 0.85 *f* *$\it{\Omega} m^2$* and 0.58 *f* *$\it{\Omega} m^2$*, respectively, which are similar to the reported values for Co/Pt systems \[42\]. In CFMS/Pt system, the SML probability 