Nonmonotonic Magnetic Field Dependence of Remnant Ferroelectric Polarization in Reduced Graphene Oxide–BiFeO ₃ Nanocomposite

The thin-film heterostructures or nanocomposites exhibit vastly different properties from those observed in bulk systems. Herein, a nanocomposite of reduced graphene oxide (RGO) and BiFeO3 (BFO), the remnant ferroelectric polarization is found to follow nonmonotonic magnetic field dependence at room temperature as applied swept across 0–20 kOe on pristine sample. Bulk BiFeO3, contrast, exhibits monotonic suppression under field. remanent polarization, present case, determined, primarily, powder neutron diffraction patterns recorded nanosized (≈20 nm) particles BFO are anchored onto sheets RGO via FeC bonds with concomitant rise covalency FeO bonds. Field-dependent competition between positive negative magnetoelectric coupling arising magnetostriction due to, respectively, interface magnetization appears have given polarization. emergence consequent change electronic structure region influenced remarkably thus creates new way tuning reconstruction interfaces graphene/single-phase-multiferroic