We investigated photon-helicity-induced magnetization precession in Co₁₋ₓPtₓ alloy thin films. In addition to field-like torque, attributable to magnetic field generation owing to { the inverse Faraday effect}, we observed non-trivial and large damping-like torque which has never been discussed for single ferromagnetic layer. The composition dependence of those two torques is effectively elucidated by a model that considers mutual coupling via spin-orbit interaction between magnetization and the electronic orbital angular momentum generated by photon-helicity. This work significantly enhances our understanding of the physics relevant to the interplay of photon-helicity and magnetization in magnetic metals.
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Nukui et al. (2024) studied this question.
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