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Skyrmionic states in noncentrosymmetric magnets with Lifshitz invariants areinvestigated within the phenomenological Dzyaloshinskii model. The interactionbetween the chiral Skyrmions, being repulsive in a broad temperature range,changes into attraction at high temperatures. This leads to a remarkableconfinement effect: near the ordering temperature Skyrmions exist only as boundstates, and Skyrmion lattices are formed by an unusual instability-typenucleation transition. Numerical investigations on two-dimensional modelsdemonstrate the confinement and the occurrence of different Skyrmion latticeprecursor states near the ordering transition that can become thermodynamicallystable by anisotropy or longitudinal softness in cubic helimagnets.

Confinement of Skyrmion states in noncentrosymmetric magnets