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We study the effect of a domain wall on the electronic transport inferromagnetic quantum wires. Due to the transverse confinement, conductionchannels arise. In the presence of a domain wall, spin up and spin downelectrons in these channels become coupled. For very short domain walls or athigh longitudinal kinetic energy, this coupling is weak, leads to very few spinflips, and a perturbative treatment is possible. For very long domain wallstructures, the spin follows adiabatically the local magnetization orientation,suppressing the effect of the domain wall on the total transmission, butreversing the spin of the electrons. In the intermediate regime, we numericallyinvestigate the spin-dependent transport behavior for different shapes of thedomain wall. We find that the knowledge of the precise shape of the domain wallis not crucial for determining the qualitative behavior. For parametersappropriate for experiments, electrons with low longitudinal energy aretransmitted adiabatically while the electrons at high longitudinal energy areessentially unaffected by the domain wall. Taking this co-existence ofdifferent regimes into account is important for the understanding of recentexperiments.Comment: 10 pages, 6 figure

Electronic transport through domain walls in ferromagnetic nanowires: Coexistence of adiabatic and nonadiabatic spin dynamics