  We explore the helicity-independent light-induced nucleation of skyrmion
lattices in ferromagnetic cobalt-based trilayers with perpendicular magnetic
anisotropy. Using Atomistic Spin Dynamics simulations, we show that a high
temperature excitation followed by magnon drops and their non-equilibrium
relaxation, accessed by an ultrafast laser excitation with specific duration
and intensity, can lead to the generation of a skyrmion lattice stable at room
temperature. The nucleation window, the topological density and the skyrmion
polarity can be additionally manipulated by external magnetic fields. Our
results provide insight into the non-equilibrium nature of skyrmionic
excitations at non-zero temperatures and pave additional routes for their use
in information technologies.
