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Título: | Phase separation enhanced magneto-electric coupling in La0.7Ca0.3MnO3/BaTiO3 ultra-thin films |
Autor: | Alberca, A. CSIC; Munuera, C. CSIC ORCID ; Azpeitia-Urkia, Jon CSIC ORCID; Kirby, B.J.; Nemes, N. M. CSIC ORCID CVN; Perez-Muñoz, A. M.; Tornos, J.; Mompean, F. J. CSIC ORCID; Leon, C.; Santamaría, Jacobo CSIC ORCID; García-Hernández, Mar CSIC ORCID | Palabras clave: | Ferroelectrics and multiferroics Surfaces, interfaces and thin films Information storage Characterization and analytical techniques |
Fecha de publicación: | 9-dic-2015 | Editor: | Springer Nature | Citación: | Scientific Reports 5: 17926 (2015) | Resumen: | We 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. | Versión del editor: | https://doi.org/10.1038/srep17926 | URI: | http://hdl.handle.net/10261/185171 | DOI: | 10.1038/srep17926 | Identificadores: | doi: 10.1038/srep17926 e-issn: 2045-2322 |
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