Co-existence of Multiferroic Memories in CoFe2O4/Bi3.4Sm0.6Ti3O12 Composite Structures

Abstract

CoFe2O4/Bi3.4 Sm0.6Ti3O12/bilayer films were synthesized by chemical solution route and deposited by spin coating on Pt (Pt/TiO2/SiO2/Si) substrate. X-ray diffraction of the bilayer and multilayer structures revealed the composite-like structure. Dielectric spectroscopy shows relaxation in dielectric loss and reaches ~ 1% at 106 Hz. CoFe2O4/Bi3.4Sm0.6Ti3O12 system shows the co-existence of ferroelectric polarization Pr>40μC/cm2 and magnetization Mr = 52 emu/cm3for bilayer, and Pr = 60μC/cm2Mr = 72 emu/c3, respectively, for four alternate layers, has been achieved at room temperature. Different permittivity and permeability may affects the coupling parameters may give rise to simultaneous ferromagnetic and ferroelectric responses.