Deterioration of exchange bias in CoO-Co bilayers by the roughness of the ZnO substrates D. Stamopoulos, M. Zeibekis, E. Manios, N. Boukos and D. Niarchos EPJ Web of Conferences, 75 (2014) 05011 Published online: 03 July 2014 DOI: 10.1051/epjconf/20147505011