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Phase separation enhanced magneto-electric coupling in La0.7Ca0.3MnO3/BaTiO3 ultra-thin films

AuthorsAlberca, A. ; Munuera, C. ; Azpeitia-Urkia, Jon ; Kirby, B.; Nemes, N. M. ; Perez-Muñoz, A. M.; Tornos, J.; Mompean, F. J. ; Leon, C.; Santamaria, J.; García-Hernández, M.
KeywordsFerroelectrics and multiferroics
Surfaces, interfaces and thin films
Information storage
Characterization and analytical techniques
Issue Date9-Dec-2015
PublisherSpringer Nature
CitationScientific Reports 5: 17926 (2015)
AbstractWe study the origin of the magnetoelectric coupling in manganite films on ferroelectric substrates. We find large magnetoelectric coupling in LaCaMnO/BaTiO ultra-thin films in experiments based on the converse magnetoelectric effect. The magnetization changes by around 30-40% upon applying electric fields on the order of 1 kV/cm to the BaTiO substrate, corresponding to magnetoelectric coupling constants on the order of α = (2-5)·10 s/m. Magnetic anisotropy is also affected by the electric field induced strain, resulting in a considerable reduction of coercive fields. We compare the magnetoelectric effect in pre-poled and unpoled BaTiO substrates. Polarized neutron reflectometry reveals a two-layer behavior with a depressed magnetic layer of around 30 Å at the interface. Magnetic force microscopy (MFM) shows a granular magnetic structure of the LaCaMnO. The magnetic granularity of the LaCaMnO film and the robust magnetoelastic coupling at the LaCaMnO/BaTiO interface are at the origin of the large magnetoelectric coupling, which is enhanced by phase separation in the manganite.
Publisher version (URL)https://doi.org/10.1038/srep17926
Identifiersdoi: 10.1038/srep17926
e-issn: 2045-2322
Appears in Collections:(ICMM) Artículos
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