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. and Munuera, C. and Azpeitia, J. and Kirby, B. and Nemes, Norbert Marcel and Pérez Muñoz, Ana Mª and Tornos, J. and Mompean, F. J. and León Yebra, Carlos and Santamaría Sánchez-Barriga, Jacobo and 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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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.

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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.

Uncontrolled Keywords:Strain, Heterostructures, Manganites, Behavior.
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
ID Code:35323
Deposited On:04 Feb 2016 11:13
Last Modified:10 Dec 2018 14:57

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