  The Interlayer Dzyaloshinskii-Moriya interaction (IL-DMI) chirally couples
spins in different ferromagnetic layers of multilayer heterostructures. So far,
samples with IL-DMI have been investigated utilizing magnetometry and
magnetotransport techniques, where the interaction manifests as a tunable
chiral exchange bias field. Here, we investigate the nanoscale configuration of
the magnetization vector in a synthetic anti-ferromagnet (SAF) with IL-DMI,
after applying demagnetizing field sequences. We add different global magnetic
field offsets to the demagnetizing sequence in order to investigate the states
that form when the IL-DMI exchange bias field is fully or partially
compensated. For magnetic imaging and vector reconstruction of the remanent
magnetic states we utilize X-ray magnetic circular dichroism photoemission
electron microscopy, evidencing the formation of 360$^{\circ}$ domain wall
rings of typically 0.5-3.0 $\mu m$ in diameter. These spin textures are only
observed when the exchange bias field due to the IL-DMI is not perfectly
compensated by the magnetic field offset. From a combination of micromagnetic
simulations, magnetic charge distribution and topology arguments, we conclude
that a non-zero remanent effective field with components both parallel and
perpendicular to the anisotropy axis of the SAF is necessary to observe the
rings. This work shows how the exchange bias field due to IL-DMI can lead to
complex metastable spin states during reversal, important for the development
of novel spintronic devices.
