  We report experimental coupling of chiral magnetism and superconductivity in
[IrFeCoPt]/Nb heterostructures. The stray field of skyrmions with radius ~50nm
is sufficient to nucleate antivortices in a 25nm Nb film, with unique
signatures in the magnetization, critical current and flux dynamics,
corroborated via simulations. We also detect a thermally-tunable
Rashba-Edelstein exchange coupling in the isolated skyrmion phase. This
realization of a strongly interacting skyrmion-(anti)vortex system opens a path
towards controllable topological hybrid materials, unattainable to date.
