Magneto-dielectric and magnetoelectric anisotropies of CoFe₂O₄/Bi₅Ti₃FeO₁₅ bilayer composite heterostructural films
2016
Bai, Yulong | Chen, Jieyu | Zhao, Shifeng | Lu, Qingshan
Bilayer composite heterostructural films consisting of magnetic CoFe₂O₄ and multiferroic Bi₅Ti₃FeO₁₅ films were prepared by the chemical solution deposition method. Morphological, ferroelectric, piezoelectric, magnetic, magneto-dielectric and magnetoelectric properties were investigated for CoFe₂O₄/Bi₅Ti₃FeO₁₅ composite films. The magneto-dielectric and magnetoelectric effects are observed for the composite films, which is attributed to the enhanced interface coupling and mechanical strain transfer due to the small lattice mismatch between CoFe₂O₄ and Bi₅Ti₃FeO₁₅ film layers. Magneto-dielectric and magnetoelectric anisotropies were also observed for the composite films. Correspondingly, the in-plane and out-of-plane magnetoelectric voltage coefficients reach 57 mV cm⁻¹ Oe⁻¹ and 78.9 mV cm⁻¹ Oe⁻¹, respectively. Thus magneto-dielectric and magnetoelectric anisotropies originate from the magnetic anisotropy of CoFe₂O₄/Bi₅Ti₃FeO₁₅ composite films. The present work provides promising candidates for applications in magnetoelectric devices.
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