RT Journal Article
T1 Ferroelectric substrate effects on the magnetism, magnetotransport, and electroresistance of La0.7Ca0.3MnO3 thin films on BaTiO3
A1 León Yebra, Carlos
A1 Biskup Zaja, Nevenko
A1 Santamaría Sánchez-Barriga, Jacobo
A1 Alberca Carretero, Aurora
A1 Andrés, Amado de
A1 García Hernández, M.
A1 Munuera, C.
A1 Mompean, F.J.
A1 Nemes, Norbert Marcel
AB La0.7Ca0.3MnO3 optimally doped epitaxial films were grown on ferroelectric BaTiO3 substrates. Electronic transport (magnetoresistance and electroresistance) and magnetic properties showed important anomalies in the temperature interval between 60 and 150 K, below the metal-insulator transition. Scanning probe microscopy revealed changes in BaTiO3 surface morphology at those temperatures. La0.7Ca0.3MnO3 thickness is a critical factor: 120-angstrom -thick films showed large anomalies sensitive to electric poling of the BaTiO3, whereas the behavior of 150-angstrom -thick films is closer to that of the reference La0.7Ca0.3MnO3 samples grown on SrTiO3. We propose that, through inhomogenous strain and electric polarization effects, the ferroelectric substrate induces an inhomogenous spin distribution in the magnetic layer. This would imply the coexistence of in-plane and out-of-plane ferromagnetic patches in La0.7Ca0.3MnO3, possibly interspersed with antiferromagnetic regions, as it has recently been theoretically predicted. Substrate poling effects are investigated, and a magnetoelectric coupling is demonstrated.
PB American Physical Society
SN 1098-0121
YR 2012
FD 2012-10-24
LK https://hdl.handle.net/20.500.14352/44420
UL https://hdl.handle.net/20.500.14352/44420
LA eng
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NO © American Physical Society. CM and NMN acknowledge Spanish MINECO for Juan de la Cierva and Ramón y Cajal fellowships. This work was supported by the Spanish MINECO through Grant Nos. MAT2011-27470-C02-01 and MAT2011-27470-C02-02.
NO Spanish MINECO
DS Docta Complutense
RD 1 may 2024