Strong magnetoelectric effect in pulse laser deposited [Ba(Zr _0.2 Ti _0.8 )O ₃ ‐0.5(Ba _0.7 Ca _0.3 )TiO ₃ ]/CoFe ₂ O ₄ bilayer thin film

Abstract

Abstract Polycrystalline bilayer thin film of multiferroic [Ba(Zr 0.2 Ti 0.8 )O 3 ‐0.5(Ba 0.7 Ca 0.3 )TiO 3 ]/CoFe 2 O 4 ([ BZT ‐0.5 BCT ]/ CFO ) has been deposited on Pt/Si (100) substrate using a pulsed laser deposition technique. The dielectric analysis reveals a significant change in the dielectric constant (~39% at a typical frequency of 100 Hz) at room temperature when a magnetic field is applied, in addition to a substantial improvement in the saturation polarization. A low leakage current density (~ 5 × 10 −7 A/cm 2 ) and a high magnetoelectric coupling coefficient (α E ) both in the transverse (~2.085 V/Oe cm) as well as in the longitudinal (~0.708 V/cm Oe) directions, indicate in‐principle usability of this system for multifunctional device applications in thin film form.