The spin-orbital interaction in heavy nonmagnetic metal/ferromagnetic metal bilayer systemshas attracted great attention and exhibited promising potentials in magnetic logic devices,where the magnetization direction is controlled by passing an electric current. It is found thatthe spin-orbital interaction induces both an effective field and torque on the magnetization,which have been attributed to two different origins: the Rashba effect and the spin Hall effect.It requires quantitative analysis to distinguish the two mechanisms. Here we show sensitivespin-orbital effective field measurements up to 10nm thick ferromagnetic layer and find theeffective field rapidly diminishes with the increase of the ferromagnetic layer thickness. Wefurther show that this effective field persists even with the insertion of a copper spacer. Thenonlocal measurement suggests that the spin-orbital effective field does not rely on the heavynormal metal/ferromagnetic metal interface.
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