Structure related magnetic properties of MnZn ferrite with ultra-fine grain structure J. Moulin, F. Mazaleyrat, Y. Champion, P. Langlois, M. Lécrivain, J. M. Grenèche, D. Michel and R. Barrué Eur. Phys. J. AP, 23 1 (2003) 49-54 Published online: 12 June 2003 DOI: 10.1051/epjap:2003040