Magnetoelectric nano-Fe3O4/CoFe2O 4∥PbZr0.53Ti0.47O3 composite

Abstract

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- Fe3 O4 Co Fe2 O4 particles, ranging from 5 to 42 nm, were prepared using a variation of the sol-gel method. A small electric field, 5-10 kV cm-1, applied at the coercive field of the nano- Fe3 O4 Co Fe2 O4 component modulates the film magnetization up to 10% of the saturation magnetization of ferrite. At the smallest particle size of 5 nm, the coercive field is as low as 25 Oe and the inverse MEE voltage coefficient is as high as (10.1 Vcm Oe)-1. © 2008 American Institute of Physics.