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

Breitenbach, M., Deniz, H., & Ebbinghaus, S. G. (2019). Magnetoelectric and HR-STEM investigations on eutectic CoFe2O4-Ba1-xSrxTiO3 composites. Journal of Physics and Chemistry of Solids, 135: 109076. doi:10.1016/j.jpcs.2019.109076.

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1-s2.0-S0022369718322467-main.pdf (Publisher version), 3MB
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https://doi.org/10.1016/j.jpcs.2019.109076 (Publisher version)
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Breitenbach, Martin1, Author
Deniz, Hakan2, Author              
Ebbinghaus, Stefan G.1, Author
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1External Organizations, ou_persistent22              
2Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society, ou_3287476              

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 Abstract: Multiferroic Ba1–xSrxTiO3–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 αME.

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 Dates: 2019-06-232019-12
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: P13834
DOI: 10.1016/j.jpcs.2019.109076
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Title: Journal of Physics and Chemistry of Solids
Source Genre: Journal
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Publ. Info: Oxford : Pergamon
Pages: - Volume / Issue: 135 Sequence Number: 109076 Start / End Page: - Identifier: ISSN: 0022-3697
CoNE: https://pure.mpg.de/cone/journals/resource/110992357322388