Abstract
A ferroelectric ceramic barium titanate (BaTiO3, BT) layer and an interfacial agent polydopamine (PDA) as the shells are coated on the cobalt ferrite (CoFe2O4, CFO) nanoparticles successively to fabricate the interfacial compatibility of this magnetic oxide. Subsequently, the coated nanoparticles are compounded with ferroelectric poly(vinylidene fluoride-trifluoro ethylene) (P(VDF-TrFE)) matrix to obtain the CFO@BT@PDA/(P(VDF-TrFE) magnetoelectric nanocomposite films. We find these nanocomposites with three phases including a CFO magnetic core, a BT piezoelectric shell and the P(VDF-TrFE) piezoelectric matrix show a considerable dielectric permittivity of 85.7 and a maximum polarization of 49.5 μC/cm2. Attractively, after poling the saturated magnetization of this film increases from 52.1 emu/g to 61.7 emu/g, corresponding to a significant magnetoelectric effect. Through non self-consistent theory (NSC), the magnetoelectric coupling coefficient (αE33) of CFO@BT@PDA/(P(VDF-TrFE) film is calculated to reach 150.58 mV/cm·Oe, indicating that this flexible multiferroic film has a prospect of application on energy collector or new information storage devices.
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