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We characterize asymmetric growth of magnetic bubble domains inperpendicularly magnetized Co/Ni multi-layers grown on Pt$_x$Ir$_{1-x}$seedlayers by application of perpendicular and in-plane magnetic fields. Usinga refined model of domain wall creep that incorporates contributions from theanisotropic elastic energy, $\varepsilon$, and a chirality-dependent prefactor,$v_0$, we elucidate factors that govern the mobility of Dzyaloshinskii domainwalls as a function of seedlayer composition. The interfacialDzyaloshinskii-Moriya Interaction magnitude is found to decrease monotonicallywith $x_{Ir}$, which is independently confirmed by Brillouin light scattering(BLS). Moreover, the persistence of significant asymmetry in velocity curvesacross the full composition range supports previous assertions that achirality-dependent attempt frequency akin to chiral damping could play acritical role in the observed trends. This work helps resolve fundamentalquestions about the factors governing Dzyaloshinskii DW creep and demonstratesvarying Pt-Ir seedlayer composition as a method to tune DMI.

Disentangling factors governing Dzyaloshinskii domain wall creep in Co/Ni thin films using Pt$_x$Ir$_{1-x}$ seedlayers