Giant orbital moments are responsible for the anisotropic magnetoresistance of atomic contacts G. Autès, C. Barreteau, M. C. Desjonquères, D. Spanjaard and M. Viret EPL, 83 1 (2008) 17010 Published online: 19 June 2008 DOI: 10.1209/0295-5075/83/17010