Ferroelectric and magnetoelectric properties of (Bi, La)Ti₃O₁₂-CoFe₂O₄ composite thin films derived by a chemical solution deposition process

ABSTRACT

Multiferroic xBi_3.25La_0.75Ti₃O₁₂-(1-x)CoFe₂O₄ composite thin films with x = 0.5, 0.6, and 0.7 were deposited on Pt/Ti/SiO₂/Si(100) substrates by a chemical solution deposition process. The well-defined ferroelectric loops are observed. The P_r values are 8.89, 11.97, and 13.78 μC/cm² under the condition of about 350 kV/cm electric field for the composite films with x = 0.5, 0.6, and 0.7 respectively. The composite films exhibit typical magnetic hysteresis loops, as well as remnant magnetizations. Magnetoelectric effect which is dependent on H_bias is observed. The composite films exhibit both good ferroelectric and magnetic properties at room temperature, as well as a magnetoelectric effect.

KEYWORDS:

• Ferroelectric
• magnetoelectric
• thin films
• electrical properties
• magnetoelectric effect