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A new magnetoelectric hybrid device composed of a nanoparticulate magnetostrictive iron oxide-cobalt ferrite film on a piezoelectric lead zirconic titanate crystal serving as both substrate and straining medium is described. Nano-Fe3O4∕CoFe2O4 particles, ranging from 5to42nm, were prepared using a variation of the sol-gel method. A small electric field, 5–10kVcm−1, applied at the coercive field of the nano-Fe3O4∕CoFe2O4 component modulates the film magnetization up to 10% of the saturation magnetization of ferrite. At the smallest particle size of 5nm, the coercive field is as low as 25Oe and the inverse MEE voltage coefficient is as high as (10.1V∕cmOe)−1.

Magnetoelectric nano-Fe3O4∕CoFe2O4∥PbZr0.53Ti0.47O3 composite