Magnetoelectric coupling in micropatterned BaTiO3/CoFe2O4 epitaxial thin film structures: Augmentation and site-dependency
Abstract
The prominent magnetoelectric (ME) effect in ME composites usually originates from an interfacial strain-mediated coupling between ferroelectric and ferromagnetic components. While ME composite bilayer thin films have been proposed for microdevice applications, the ME coupling is usually diminished because of the substrate clamping effect. Here, we apply simple CMOS/MEMS compatible top-down fabrication techniques to ferroelectric BaTiO3 (BTO) and ferromagnetic CoFe2O4 (CFO) bilayer epitaxial thin films to control the substrate clamping. We found augmented ME coupling in micro-patterned bilayer thin films compared to the as-deposited films due to the reduced substrate clamping. In addition, a site-dependent ME coupling within the microstructure was observed. Larger ME coupling was obtained near the edge of the microstructure, and site-dependent ferroelectric imprints were observed on the micropattern. This can be attributed to the non-uniform substrate clamping across the film, and the strain gradient developed in the BTO layer due to the magnetostriction of CFO. Our findings provide additional insights to the design of micro- and nanoscale devices based on 2–2 ME composite thin films. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000493319Publication status
publishedExternal links
Journal / series
Applied Physics LettersVolume
Pages / Article No.
Publisher
American Institute of PhysicsOrganisational unit
03627 - Nelson, Bradley J. / Nelson, Bradley J.
02205 - FIRST-Lab / FIRST Center for Micro- and Nanoscience
08705 - Gruppe Pané Vidal
Funding
771565C - Highly Integrated Nanoscale Robots for Targeted Delivery to the Central Nervous System (EC)
764977 - Advanced integrative solutions to Corrosion problems beyond micro-scale: towards long-term durability of miniaturized Biomedical, Electronic and Energy systems (EC)
190451 - 3D Magnetic Nanoparticle Assemblies for Tumor-Targeted Nanomedicine: a Microrobotic Approach (SNF)
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