  Many future concepts for spintronic devices are based on the current-driven
motion of magnetic domain walls through nanowires. Consequently a thorough
understanding of the domain wall mobility is required. However, the magnitude
of the nonadiabatic component of the spin-transfer torque driving the domain
wall is still debated today as various experimental methods give rise to a
large range of values for the degree of nonadiabaticity. Strikingly,
experiments based on vortex domain wall motion in magnetic nanowires
consistently result in lower values compared to other methods. Based on the
micromagnetic simulations presented in this contribution we can attribute this
discrepancy to the influence of distributed disorder which vastly affects the
vortex domain wall mobility, but is most often not taken into account in the
models adopted to extract the degree of nonadiabaticity.
