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Recent studies rediscovered the crucial role of field-like spin orbit torque(SOT) in nanosecond-timescale SOT dynamics. However, there is not yet aneffective way to control its relative amplitude. Here, we experimentallymodulate the field-like SOT in W/CoFeB/MgO trilayers through tuning theinterfacial spin accumulation. By performing spin Hall magnetoresistancemeasurement, we find that the CoFeB with enhanced spin dephasing, eithergenerated from larger layer thickness or from proper annealing, can distinctlyboost the spin absorption and enhance the interfacial spin mixing conductanceG_r. While the damping-like torque efficiency increases with G_r, thefield-like torque efficiency turns out to decrease with it. The results suggestthat the interfacial spin accumulation, which largely contributes to afield-like torque, is reduced by higher interfacial spin transparency. Our workshows a new path to further improve the performance of SOT-based magneticdevices.

Modulation of field-like spin orbit torque in heavy metal / ferromagnet heterostructure