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We present an ab initio study of spin dependent transport in armchair carbonnanotubes with transition metal adsorbates, iron or vanadium. We neglect theeffect of tube curvature and model the nanotube by graphene with periodicboundary conditions. A density functional theory based nonequilibrium Green'sfunction method is used to compute the electronic structure and zero-biasconductance. The presence of the adsorbate causes a strong scattering ofelectrons of one spin type only. The scattering is shown to be due to couplingof the two armchair band states to the metal 3d orbitals with matching symmetrycausing Fano resonances appearing as dips in the transmission function. Thespin type (majority/minority) being scattered depends on the adsorbate and isexplained in terms of d-state filling. The results are qualitatively reproducedusing a simple tight-binding model, which is then used to investigate thedependence of the transmission on the nanotube width. We find a decrease in thewidth of the transmission dip as the tube-size increases.

Ab initio study of spin-dependent transport in carbon nanotubes with iron and vanadium adatoms