A magnetoelectric (ME) composite with controlled nanostructures is synthesized using co-assembly of two inorganic precursors with a block copolymer. This solution processed material consists of hexagonally arranged ferromagnetic cobalt ferrite [CoFe2O4, CFO] nano-cylinders within a matrix of ferroelectric lead zirconium titanate [Pb1.1(Zr0.53Ti0.47)O3, PZT] when thin films were prepared by spin coating. The initial magnetic permeability of the self-assembled CFO/PZT nano-composite changes by a factor of five through the application of 2.5 V.

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