Onset of non-collinear magnetism in small Fe clusters P. Ruiz-Díaz, J. Dorantes-Davila and G. M. Pastor Eur. Phys. J. D, 52 1-3 (2009) 175-178 Published online: 24 January 2009 DOI: 10.1140/epjd/e2008-00254-4