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