Nanocomposite Electroceramics with Ferroelectric and Ferromagnetic Responses

Abstract Bi 3.4 Nd 0.6 Ti 3 O 12 and CoFe 2 O 4 were synthesized by chemical solution route. Multilayer structures (two, four, and ten alternate layers) of CoFe 2 O 4 /Bi 3.4 Nd 0.6 Ti 3 O 12 were deposited on Pt substrate (Pt/TiO 2 /SiO 2 /Si) by spin coating. X- ray diffraction of multilayer structures reveals composite-like polycrystalline film. Leakage current of the composite ten multilayers was less than 10 -6 A and Ohmic-like bulk response up to electric field 120 kV/cm, showed the co-existence of ferroelectric polarization (P r ) > 47 μC/cm 2 and ferromagnetic memory (M r ) > 400 emu/cm 3 at room temperature. FE and FM coupling in the same material can be attributed to stress different permeability and permittivity of the materials involved.