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We have quantitatively studied the spin-orbit torque purely generated by thespin Hall effect in a wide range of temperatures by intensionally eliminatingthe Rashba spin-orbit torque using Pt/Co/Pt trilayers with asymmetricthicknesses of the top and bottom Pt layers. The vanishingly small contributionfrom the Rashba effect has been confirmed through the vector measurements ofthe current-induced effective fields. In order to precisely determine the valueof the spin Hall torque, the complete cancelation of the spin Hall torque hasbeen verified by fabricating symmetric Pt/Co/Pt structure on SiO2 and Gd3Ga5O12(GGG) substrates. Despite of the complete cance- lation on the GGG substrate,the spin Hall torque cannot be completely canceled out even when the top andbottom Pt layers have same thicknesses on the SiO2 substrate, which suggeststhat Pt/Co/Pt trilayers on a GGG substrate is a suitable system for precisemeasurements of the spin Hall torque. The result of the vector measurements onPt/Co/Pt/GGG from 300 to 10 K shows that the spin Hall torque is almostindependent of temperature, which is quantitatively reproduced under theassumption of the temperature-independent spin Hall angle of Pt.

Asymmetric Pt/Co/Pt structure as a platform for extracting pure spin Hall torque