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We examine magnetic domain patterns in symmetric [Co/Ni]$_M$ and asymmetric[Pt/(Co/Ni)$_M$/Ir]$_N$ multi-layers using Fresnel mode Lorentz transmissionelectron microscopy (LTEM). In the symmetric multi-layer, where theDzyaloshinskii-Moriya Interaction is expected to be zero, we observe purelyBloch type domain walls with no preferred chirality. In the asymmetricmulti-layers, where significant interfacial DMI is present, we observe domainpatterns with chiral N\'eel domain walls, which evolve into sub-100nm isolatedN\'eel Skyrmions with the application of a perpendicular field. The impact oflayer thickness and film stack on interfacial magnetic properties is discussedin the context of developing a tunable multi-layer system for future spintronicapplications.

Lorentz TEM investigation of chiral spin textures and N\'eel Skyrmions in asymmetric [Pt/(Co/Ni)$_M$/Ir]$_N$ multi-layer thin films