Magneto-transport and magnetic textures in Ho/FeCoGd/β-W multilayers with additive chiral exchange*

Here we report on the evaluation of interface-driven magnetic interactions in a uniquely designed multilayer where each magnetic layer of two antiferromagnetically coupled sublattices of 3d and 4f moments is sandwiched between the layers of β-tungsten and holmium whose spin Hall angles are large but opposite in sign. The atomic and magnetic periodicity of these multilayers is established by polarized neutron reflectivity measurements and the presence of a stripe domain spin texture of zero remanence with x-ray photoelectron microscopy. Measurements of the Hall resistivity (ρ_xy(T, H))  together with static magnetization (M(T,H)) over a broad range of temperature (T) and magnetic field (H) indicate impending compensation between 3d and 4f sublattices at T > 350 K and a distinct topological contribution to ρ_xy. It is argued that this topological effect draws its strength from the interfacial Dzyaloshinskii – Moriya Interaction.