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It is known that ultrafast laser pulses can be used to deterministicallyswitch magnetisation and create skyrmions, however the deterministic creationof a single N\'eel skyrmion after ultrafast demagnetisation remains an openquestion. Here we show domain wall skyrmions also emerge in systems with brokeninversion symmetry after exposure to an ultrafast laser pulse, carrying aninteger topological charge. Whilst domain wall skyrmions do not appear in therelaxed state due to quick thermal decay following an Arrhenius law, they playa key role in controlling the final skyrmion population through annihilationswith skyrmions of opposite topological charge, with the resultant skyrmionstates following a Poisson distribution. Using single-shot linearly polarisedlaser pulses, as well as a train of circularly polarised laser pulses, we showthat when a high degree of disorder is created, the possibility of nucleating asingle N\'eel skyrmion is accompanied by the possibility of nucleating askyrmion with domain wall skyrmion pair, which results in a self-annihilationcollapse.

Emergence of Transient Domain Wall Skyrmions after Ultrafast Demagnetisation