Magnetocapacitance Properties of Multilayered CoFe2O4/BaTiO3/CoFe2O4 Thin Film by Pulsed Laser Deposition

Abstract

CoFe2O4(CFO)/BaTiO3(BTO)/CoFe2O4(CFO) multilayered thin films were deposited on Pt/TiO2/SiO2/Si substrates by the pulsed laser deposition (PLD) system with KrF excimer laser (λ = 248 nm). BTO, CFO, BTO/ CFO and CFO/BTO/CFO structured thin films were prepared and their crystal structures and microstructures, as well as their magnetic and magneto-electrical properties, were studied. The C-V characteristics of these multilayered thin films with different capacitor structures were obtained to confirm the change in their capacitances under a magnetic field. Finally, the capacitance of the CFO/BTO/CFO thin film as a function of bias voltage under an in-plane magnetic field of 1,000 Oe increased to 951.04 pF at 1 MHz, from 831.90 pF measured under no magnetic field, indicating 14.3% increase in magnetocapacitance. © The Korean Magnetics Society. All rights reserved.