arXiv2026
Magnetic skyrmions hold high promise for low power spintronic and neuromorphic computing. However, existing manipulation schemes rely predominantly on local thermal excitation, rendering nucleation stochastic and lacking a non-destructive mechanism for targeted erasure. Here, we demonstrate a deterministic, optomagnetic field-driven paradigm for fast, all-optical writing and erasing of magnetic skyrmion crystals using a magneto-plasmonic metasurface. By tailoring surface lattice resonances in a periodic nanodisk array, circularly polarized light excites giant super-circular optical spin densities that drive intense circulating drift photocurrents via the inverse Faraday effect. This delivers synchronized picosecond magnetic field pulses into an adjacent magnetic multilayer. Micromagnetic simulations reveal that a single optical pulse deterministically nucleates stable Néel skyrmions through a transient Bloch to Néel relaxation pathway governed by optical helicity and interfacial Dzyaloshinskii Moriya interaction. Crucially, reversing incident light helicity allows on-demand topological reconfiguration: under a confining bias field, the inverted optomagnetic field unwinds pre existing skyrmions to restore a uniform ground state. Furthermore, we demonstrate the targeted writing of stable skyrmionium states. By bypassing stochastic thermal cycles and achieving reversible topological control on picosecond timescales, this work bridges nanophotonics, plasmonics, and magnetism, establishing a scalable foundation for high-speed, reconfigurable information processing and unconventional computing.