Coercivity reduction in a two-dimensional array of nano-particles Michel Morales-Meza, Paul P. Horley, Alexander Sukhov and Jamal Berakdar Eur. Phys. J. B, 87 8 (2014) 186 Published online: 11 August 2014 DOI: 10.1140/epjb/e2014-50311-2