The effect of inserting a Pt layer in Pt/Co/Ta structure on spin orbit torque

Spin-orbit torque arising from ferromagnetic heterostructures consisting of an ultrathin ferromagnet sandwiched between a heavy metal and an oxide layer has attracted extensive attention for low power spintronics devices applications. The charge current flowing through the HM can influence the magnetization of the adjacent FM layer via the SOT effect that collectively contributed by the effects of spin Haft and Rashba. To quantify the magnitude of the SOT, two effective fields, a damping-like term alone the current direction.