Using spin-dependent specular and off-specular polarized neutron reflectivity (PNR), we report the observation of a twisted helical magnetic structure with planar 2π domain walls (DWs) and highly correlated magnetic domains in a Gd/Co multilayer. Specular PNR with a polarization analysis reveals the formation of planar 2π DWs below a compensation temperature (T_comp), resulting in a negative exchange bias in this system. Off-specular PNR with spin polarization showed the development of magnetic inhomogeneities (increase in magnetic roughness) for the central part (thickness ∼25–30 Å) of each Gd layer, where magnetization is aligned perpendicular (in plane) to an applied field. This is contributing towards an antisymmetric magnetoresistance at T_comp in the system. The magnetic roughness is vertically correlated and results in a Bragg sheet observed in the spin-flip channel of off-specular PNR data. The growth and tunability of highly correlated magnetic inhomogeneities (roughness) and the domain structure around T_comp in a combination of a twisted helical magnetic structure with planar 2π DWs will be key for applications in all-spin-based technology.