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Magnetoelectric Coupling in Epitaxial Multiferroic BiFeO 3 –BaTiO 3 Composite Thin Films
Author(s) -
Hohenberger Stefan,
Lazenka Vera,
Selle Susanne,
Patzig Christian,
Temst Kristiaan,
Lorenz Michael
Publication year - 2020
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201900613
Subject(s) - materials science , multiferroics , ferroelectricity , epitaxy , thin film , pulsed laser deposition , coupling (piping) , texture (cosmology) , composite number , condensed matter physics , layer (electronics) , optoelectronics , nanotechnology , composite material , dielectric , image (mathematics) , physics , artificial intelligence , computer science
Herein, the magnetoelectric (ME) performance of epitaxial multilayer composite films built from nanometer‐thick layers of multiferroic BiFeO 3 and ferroelectric BaTiO 3 is reviewed. A successful implementation of shadow‐mask pulsed laser deposition considerably reduces the interface and surface roughness of the multilayers. In dependence of double‐layer thickness and the degree of structural perfection, the multilayers show high ME voltage coefficients up to 480 V cm −1 Oe −1 at 300 K and 0 T bias magnetic field. With decreasing double‐layer thickness, an interface‐driven effect critically enhances the ME coupling in this strain and charge–comediated system. Interestingly, the characteristics of temperature and DC magnetic field dependencies of magnetoelectric voltage coefficients change with the transition from the 2D to 3D character of the single layers, i.e., for BiFeO 3 layers thicker than 5 nm within the multilayers. These changes are attributed to variations of the contributing ME coupling mechanisms. Furthermore, scanning transmission electron microscopy (STEM) with energy‐dispersive X‐ray (EDX) spectroscopy mapping‐based nanoanalysis indicates that chemical effects at the interfaces play an important role for the ME performance of the BiFeO 3 –BaTiO 3 multilayer thin films.