always a potential candidate for the AHE phenomena \[40,41\]. The saturation magnetization measurements of all the samples, indicated the presence of MPE in Pt or dead layer formation at interface which may result in the decrease of *$V_{AHE}$* contribution as the Pt thickness increases from 3 to 20 nm. However, the AMR values are of similar order in all the samples. The finite AMR contribution indicates that the samples are anisotropic in nature. The positive value of *$V_{sp}$* indicates the positive spin Hall angle in Pt, which is consistent with literature \[34\].

![$g_{\it{eff}}^{\uparrow \downarrow}$ (a) and spin Hall angle (b) as a function of Pt thickness. Solid line in (a) is the best fit using the equation (12)[]{data-label="fig6"}](fig6.png){width="50.00000%"}

The lowest $\alpha$ is found to be in S2 shows the maximum spin pumping voltage which is because of smooth interface between CFMS/ Pt. *$V_{sp}$* is getting dominated by the conductivity of Pt for thicker Pt sample. Thus the *$V_{sp}$* decreases with higher *$t_{Pt}$* value. Figure \[fig6\] shows the graph between *$g_{\it{eff}}^{\uparrow \downarrow}$* and Pt thickness. *$g_{\it{eff}}^{\uparrow \downarrow}$* was calculated by the following expression using damping constant\[2\]:

$$\label{q11}
 g_{\it{eff}^{\uparrow \downarrow}}=\frac{\Delta\alpha 4\pi M_{s}t_{CFMS}}{g\mu_{B}}$$

where *$\Delta\alpha$*, *$t_{CFMS}$*, *$\mu_{B}$*, *g* are the change in the 