Electric field-assisted storage of information using magnetoelectric materials permits a novel class of memory devices. Magnetic nanoparticles can be considered as building blocks for artificial super-structures for magnetoelectric composites. In this work, monodisperse ferrimagnetic nanoparticles (NPs) embedded into ferroelectric barium titanate (BTO) films were fabricated by a combination of spin coating of the NPs and pulsed laser deposition of the BTO films. The composite consists of a stack of two BTO films sandwiching one monolayer of iron oxide NPs. We observed a magnetoelectric coupling due to strain and interface charge co-mediation between the BTO and the NPs. This is demonstrated by magnetization measurements as a function of DC and AC electric fields.