Magnetic multilayers (MMLs) composed of alternating ferromagnetic / heavy-metal layers are one of the most technologically promising classes of skyrmion-hosting systems due to number of their advantages, such as skyrmion stability at room temperature and their tunability via layer engineering . Through the combination of broken inversion symmetry and spin-orbit-coupling at the asymmetric interfaces, Dzyaloshinskii-Moriya interaction (DMI) is induced that leads to stabilization of Néel-type skyrmions in finite magnetic fields . In this study we utilized small-angle neutron scattering (SANS) and polarized neutron reflectometry (PNR) methods to probe the magnetic order in [Pt/CoFeB/Ru]$_N$ ($N$=10 and 40 repetitions) MMLs with bulk and layer-resolved sensitivities, respectively. Neutron scattering experiments with polarisation analysis are needed to clarify the relation between Néel (DMI-induced) and Bloch (dipolar-induced) domain walls, that seem to be inaccessible in relatively thick samples (hundreds of nm) by any other experimental technique . Here, long-periodic magnetic stripe domains and orientationally disordered skyrmion phases were unambiguously observed by SANS and off-specular reflectivity. Furthermore, by using the parameters deduced from quantitative modelling of the PNR, we were be able to refine the Hamiltonian parameters used for micromagnetic models.
 A. Fert, N. Reyren and V. Cros, Nat. Rev. Mater. 2, 17031 (2017)
 W. Legrand, et al. Science Advances 4.7, eaat0415 (2018)