This thesis tries to fill in this gap, by providing a systematic study on the effects of interfaces on the SOTs, in Pt-based NM/FM/HM multilayers with in-plane magnetic anisotropy. For this purpose, three different, but related avenues, are explored. First, the evolution of the Damping-Like and Field-Like effective fields is studied as a function of Pt layer thickness. Next, the properties of the interfaces are changed by modifying the crystallographic structure of the interface. Last but not least, we studied the influence of interface oxidation on the anatomy of the torques.