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The interfacial Dzyaloshinskii-Moriya interaction (DMI) is important forchiral domain walls (DWs) and for stabilizing magnetic skyrmions. We study theeffects of introducing increasing thicknesses of Ir, from zero to 2 nm, into aPt/Co/Ta multilayer between the Co and Ta. We observe a marked increase inmagnetic moment, due to the suppression of the dead layer at the interface withTa, but the perpendicular anisotropy is hardly affected. All samples show auniversal scaling of the field-driven domain wall velocity across the creep anddepinning regimes. Asymmetric bubble expansion shows that DWs in all of thesamples have the left-handed N\'{e}el form. The value of in-plane field atwhich the creep velocity shows a minimum drops markedly on the introduction ofIr, as does the frequency shift of the Stokes and anti-Stokes peaks inBrillouin light scattering measurements. Despite this qualitative similarity,there are quantitative differences in the DMI strength given by the twomeasurements, with BLS often returning higher values. Many features in bubbleexpansion velocity curves do not fit simple models commonly used to date,namely a lack of symmetry about the velocity minimum and no difference invelocities at high in-plane field. These features are explained by the use of amodel in which the depinning field is allowed to vary with in-plane field in away determined from micromagnetic simulations. This theory shows that velocityminimum underestimates the DMI field, consistent with BLS returning highervalues. Our results suggest that the DMI at an Ir/Co interface has the samesign as the DMI at a Pt/Co interface.

Domain Wall Motion and Interfacial Dzyaloshinskii-Moriya Interactions in Pt/Co/Ir$(t_\mathrm{Ir})$/Ta Multilayers