On the origin of multi-step spin transition behaviour in 1D nanoparticles Daniel Chiruta, Catalin-Maricel Jureschi, Jorge Linares, Pierre Richard Dahoo, Yann Garcia and Aurelian Rotaru Eur. Phys. J. B, 88 9 (2015) 233 Published online: 21 September 2015 DOI: 10.1140/epjb/e2015-60340-x