It was recently reported that THz emission can be realized in heterostructures composed of ferromagneticand non-magnetic metal thin films via dynamical spin-to charge conversion. This occursfrom interfacial Rashba spin-orbit coupling or inverted spin-Hall effect (ISHE) and evidencedvia time-dependent spectroscopy. This particular work and objectives focus on last results ofTHz emission provided by optimized growth bilayers composed of a high-spin orbit material anda ferromagnetic layer Co/Pt in different configurations by inserting gold, titanium and rutheniumthin layers for better electronic matching. Those bilayers state-of-the-art analysis is based on experimentscombining RF-spin pumping and spin-to-charge conversion by ISHE . The THzexperiments consist in exciting magnetization and spin-currents within the FM layer via femtosecondlaser excitation and measuring, in the picosecond timescale, the relaxation of the correlatedspin and charge currents responsible for THz dipolar emission.