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We demonstrate that the magneto-optic-Kerr effect with normal light incidencecan be used to obtain quantitative optical measurements of both components ofspin-orbit-induced torque (both the antidamping and effective-field components)in heavy-metal/ferromagnet bilayers. This is achieved by analyzing thequadratic Kerr effect as well as the polar Kerr effect. The two effects can bedistinguished by properly selecting the polarization of the incident light. Weuse this all-optical technique to determine the spin-orbit torques generated bya series of Pt/Permalloy samples, finding values in excellent agreement withspin-torque ferromagnetic resonance measurements.

All-Optical Vector Measurement of Spin-Orbit-Induced Torques Using Both Polar and Quadratic Magneto-Optic Kerr Effects