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arXiv · 2303.08493

Impact of magnetization and hyperfine field distribution on high magnetoelectric coupling strength in BaTiO$_3$-BiFeO$_3$ multilayers

Johanna K. Jochum·Michael Lorenz·Haraldur P. Gunnlaugsson·Christian Patzig·Thomas Höche·Marius Grundmann·André Vantomme·Kristiaan Temst·Margriet J. Van Bael·Vera Lazenka
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Abstract

Understanding the mechanisms of magnetoelectric (ME) coupling within multiferroic structures is paramount from a fundamental as well as an applied point of view. We report here that the magnetoelectric properties, as well as the magnetization, of BaTiO$_3$-BiFeO$_3$ superlattices can be tuned by varying the BiFeO$_3$ layer thickness. The magnetoelectric voltage coefficient ($\alpha_{ME}$) reaches its maximum of 60.2 Vcm$^{-1}$Oe$^{-1}$ at 300 K, one of the highest values reported so far, for a sample with a BiFeO$_3$ thickness of 5 nm and a BaTiO$_3$ thickness of 10 nm. To gain deeper insight into the increased magnetoelectric coupling, and both the local and macroscopic magnetic properties, samples with varying BiFeO$_3$ thicknesses have been investigated. Correlations were established between the hyperfine field (HFF), the magnetoelectric voltage coefficient and the magnetization. The possible mechanisms responsible for the strong magnetoelectric coupling are discussed.

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Johanna K. Jochum, Michael Lorenz, Haraldur P. Gunnlaugsson, Christian Patzig, Thomas Höche, Marius Grundmann, André Vantomme, Kristiaan Temst, Margriet J. Van Bael, Vera Lazenka. 2023-03-15. Impact of magnetization and hyperfine field distribution on high magnetoelectric coupling strength in BaTiO$_3$-BiFeO$_3$ multilayers. https://doi.org/10.1039/c8nr00430g

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