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Título:
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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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Autores:
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Alberca, A. ;
Munuera, C. ;
Azpeitia, J. ;
Kirby, B. ;
Nemes, Norbert Marcel ;
Pérez Muñoz, Ana Mª ;
Tornos, J. ;
Mompean, F. J. ;
León Yebra, Carlos ;
Santamaría Sánchez-Barriga, Jacobo ;
Gárcia Hernández, M.
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Tipo de documento:
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texto impreso
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Editorial:
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Nature Publishing Group, 2015-12-09
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Dimensiones:
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application/pdf
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Nota general:
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cc_by
info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Electricidad
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Materia = Ciencias: Física: Electrónica
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Tipo = Artículo
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Resumen:
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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 ?=(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.
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En línea:
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https://eprints.ucm.es/35323/1/Santamar%C3%ADaJ%2002%20libre%20%2B%20CC.pdf
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