Magnetoelectric and HR-STEM investigations on eutectic CoFe2O4-Ba1-xSrxTiO3 
composites

Breitenbach, Martin; Deniz, Hakan; Ebbinghaus, Stefan G.

doi:10.1016/j.jpcs.2019.109076

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Magnetoelectric and HR-STEM investigations on eutectic CoFe₂O₄-Ba_1-xSr_xTiO₃ composites

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Deniz, Hakan
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Citation

Breitenbach, M., Deniz, H., & Ebbinghaus, S. G. (2019). Magnetoelectric and HR-STEM investigations on eutectic CoFe₂O₄-Ba_1-xSr_xTiO₃ composites. Journal of Physics and Chemistry of Solids, 135: 109076. doi:10.1016/j.jpcs.2019.109076.

Cite as: https://hdl.handle.net/21.11116/0000-0009-124E-C

Abstract

Multiferroic Ba_1–xSr_xTiO₃–CoFe₂O₄ (x = 0.03, 0.05) composites with rarely investigated 3-3 connectivity were prepared by eutectic crystallization in an optical floating zone furnace. High-resolution scanning transmission electron microscopy investigations of the CoFe₂O₄–BaTiO₃ interface revealed an almost perfect connection between both components. These micrographs also showed that the impact of post-annealing in air was much larger than expected and resulted in formation of small BaTiO₃ inclusions in the CoFe₂O₄ phase. The magnetoelectric coefficient αME was studied in detail with respect to its dependence on the static magnetic field, the frequency of the driving AC-field and temperature. Furthermore, the influence of different growth rates (5, 10 and 20 mm h^-1), chemical composition, sample thickness and the alignment of electrical polarization and magnetic field (collinear or vertical) on the magnetoelectric properties were studied. The largest value of αME = 1.3 mV Oe^-1 cm^-1 was found for a sample grown at 5 mm h^-1. For even slower growth rates, a higher Sr content was required to avoid the formation of impurity phases leading to a decrease of α_ME.