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Phase separation enhanced magneto-electric coupling in La_(0.7)Ca_(0.3)MnO_(3)/BaTiO_(3) ultra-thin films

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Alberca, A. y Munuera, C. y Azpeitia, J. y Kirby, B. y Nemes, Norbert Marcel y Pérez Muñoz, Ana Mª y Tornos, J. y Mompean, F. J. y León Yebra, Carlos y Santamaría Sánchez-Barriga, Jacobo y García Hernández, M. (2015) Phase separation enhanced magneto-electric coupling in La_(0.7)Ca_(0.3)MnO_(3)/BaTiO_(3) ultra-thin films. Scientific reports, 5 . ISSN 2045-2322

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URL Oficial: http://dx.doi.org/10.1038/srep17926


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http://www.nature.com/Editorial


Resumen

We study the origin ofthe magnetoelectric coupling in manganite films on ferroelectric substrates. We find large magnetoelectric coupling in La_(0.7)Ca_(0.3)MnO_(3)/BaTiO_(3) 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 1kV/cm to the BaTiO_(3) substrate, corresponding to magnetoelectric coupling constants on the order of α=(2–5)·10−7 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 effectin pre-poled and unpoled BaTiO_(3) substrates. Polarized neutron reflectometry reveals a two-layer behavior with a depressed magnetic layer of around 30Å atthe interface. Magnetic force microscopy (MFM) shows a granular magnetic structure of the La0.7Ca0.3MnO3.The magnetic granularity of the La_(0.7)Ca_(0.3)MnO_(3) film and the robust magnetoelastic coupling at the La_(0.7)Ca_(0.3)MnO_(3)/BaTiO_(3) interface are at the origin of the large magnetoelectric coupling, which is enhanced by phase separation in the manganite.


Tipo de documento:Artículo
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The authors are grateful to Julie Borchers and Chuck Majkrzak for stimulating discussions. The authors acknowledge financial support from the Spanish MICINN and MINECO through grants MAT2011-27470-C02-01, MAT2011-27470 C02-02, MAT2014-52405-C2-2-R, MAT2014-52405-C2-1R and CSD 2009-00013.

Palabras clave:Strain, Heterostructures, Manganites, Behavior.
Materias:Ciencias > Física > Electricidad
Ciencias > Física > Electrónica
Código ID:35323
Depositado:04 Feb 2016 11:13
Última Modificación:10 Dic 2018 14:57

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