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Spin-orbit torques (SOT) allow the electrical control of magnetic states.Current-induced SOT switching of the perpendicular magnetization is ofparticular technological importance. The SOT consists of damping-like andfield-like torques so that the efficient SOT switching requires to understandcombined effects of the two torque-components. Previous quasi-staticmeasurements have reported an increased switching probability with the width ofcurrent pulses, as predicted with considering the damping-like torque only.Here we report a decreased switching probability at longer pulse-widths, basedon time-resolved measurements. Micromagnetic analysis reveals that thisanomalous SOT switching results from domain wall reflections at sample edges.The domain wall reflection is found to strongly depend on the field-like torqueand its relative sign to the damping-like torque. Our result demonstrates a keyrole of the field-like torque in the deterministic SOT switching and notifiesthe importance of sign correlation of the two torque-components, which may shedlight on the SOT switching mechanism.

Anomalous spin-orbit torque switching due to field-like torque-assisted domain wall reflection