Photoinduced Control of Anisotropic Dzyaloshinskii–Moriya Interactions in Rashba–Dresselhaus Spin–Orbit‐Coupled Systems

Chiral magnetic skyrmions are topologically protected spin textures of intense interest for both fundamental physics and next‐generation spintronic devices. Their stability arises from Dzyaloshinskii–Moriya interactions (DMIs) in systems with broken inversion symmetry and strong spin–orbit coupling. Here, anisotropic DMI is analyzed in magnetic thin films with coexisting Rashba and Dresselhaus spin–orbit couplings under off‐resonant electromagnetic driving. Employing a Floquet perturbative approach, an effective Hamiltonian that includes the light‐induced exchange interactions is derived. The analysis reveals that Rashba and Dresselhaus spin–orbit couplings yield DMI contributions of equal magnitude but with a relative phase shift under field driving. This phase‐sensitive asymmetry induces anisotropic DMI, thereby controlling the chirality and helicity of skyrmion spin textures. It is shown that field‐driven anisotropy strongly modulates the DMI coupling coefficients. These results provide a new strategy to dynamically engineer DMI and skyrmion properties via light and spin–orbit interactions, offering design principles for reconfigurable skyrmion‐based devices.