S1 at the angles $\phi$= 0$^{\circ}$ (a), 30$^{\circ}$ (b), 90$^{\circ}$ (c) 180$^{\circ}$ (d). It should be noted that $\phi$= 0$^{\circ}$ means that the field was applied along the easy axis of the sample. There has been very less signal observed at $\phi$= 90$^{\circ}$ (Fig. \[fig3\](b)). This is due to the negligible amount of spin accumulation parallel to the applied magnetic field. It is evident from Fig. \[fig3\](a) and (d) that the sign of $V_{meas}$ is reversed when $\phi$ moves from 0$^{\circ}$ to 180$^{\circ}$. This indicates that the voltage is majorly produced by the spin pumping. It is well known that if the sign of the $V_{meas}$ does not reverse with angle, then the contribution solely comes from different spin rectification effects.

Figure \[fig4\] shows the *$v_{meas}$* versus $\it{H}$ plot for the sample S5 measured at $\phi$= 0$^{\circ}$ (a), 30$^{\circ}$ (b), 90$^{\circ}$ (c) 180$^{\circ}$ (d). The similar kind of ISHE signal was observer for all the samples (data not shown). It is observed that the strength of the $V_{meas}$ for sample S5 (20 nm thick Pt) is three times smaller than that of the sample S1 (3 nm thick Pt).This is consistent to the fact that ISHE voltage is inversely proportional 