We have grown mixed magnetite/cobalt ferrite epitaxial films on SrTiO3 by infrared pulsed-laser deposition. Diffraction experiments indicate epitaxial growth with a relaxed lattice spacing. The films are flat with two distinct island types: nanometric rectangular mounds in two perpendicular orientations, and larger square islands, attributed to the two main components of the film as determined by Mossbauer spectroscopy. The origin of the segregation is suggested to be the oxygen-deficiency during growth. (C) 2015 Elsevier B.V. All rights reserved.