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  4. Impact of magnetization and hyperfine field distribution on high magnetoelectric coupling strength in BaTiO3-BiFeO3 multilayers
 
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2018
Journal Article
Title

Impact of magnetization and hyperfine field distribution on high magnetoelectric coupling strength in BaTiO3-BiFeO3 multilayers

Abstract
Correlations were established between the hyperfine field distribution around the Fe atoms, the multiferroic properties, and the high magnetoelectric coefficient in BaTiO3-BiFeO3 multilayer stacks with variable BiFeO3 single layer thickness, down to 5 nm. Of key importance in this study was the deposition of 57Fe - enriched BiFeO3, which enhances the sensitivity of conversion electron Mössbauer spectroscopy by orders of magnitude. The magnetoelectric coefficient aME reaches a maximum of 60.2 V cm−1 Oe−1 at 300 K and at a DC bias field of 2 Tesla for a sample of 15 × (10 nm BaTiO3-5 nm BiFeO3) and is one of the highest values reported so far. Interestingly, the highest aME is connected to a high asymmetry of the hyperfine field distribution of the multilayer composite samples. The possible mechanisms responsible for the strong magnetoelectric coupling are discussed.
Author(s)
Jochum, J.K.
Lorenz, M.
Gunnlaugsson, H.P.
Patzig, C.
Höche, T.
Grundmann, M.
Vantomme, A.
Temst, K.
Bael, M.J. van
Lazenka, V.
Journal
Nanoscale  
Open Access
DOI
10.1039/c8nr00430g
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Fraunhofer-Institut für Mikrostruktur von Werkstoffen und Systemen IMWS  
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