Magnetoelastic coupling in La_(0.7)Ca_(0.3)MnO_(3)/BaTiO_(3) ultrathin films



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Alberca, A. and Nemes, Norbert Marcel and Mompean, F. J. and Fehér, T. and Simón, F. and Tornos, J. and León Yebra, Carlos and Munuera, C. and Kirby, B. J. and Fitzsimmons, M. R. and Hernando Grande, Antonio and Santamaría Sánchez-Barriga, Jacobo and García Hernández, M. (2013) Magnetoelastic coupling in La_(0.7)Ca_(0.3)MnO_(3)/BaTiO_(3) ultrathin films. Physical review B, 88 (13). ISSN 1098-0121

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The magnetism of La_(0.7)Ca_(0.3)MnO_(3) (LCMO) epitaxial thin films grown on SrTiO_(3) (STO) and BaTiO_(3) (BTO) substrates is studied using polarized neutron reflectometry (PNR) and ferromagnetic resonance (FMR) techniques. In LCMO/BTO, PNR reveals a strongly suppressed magnetization of 300 kA/m, equivalent to a magnetic moment of 2 μB/Mn, throughout the LCMO layer, amounting to half the expected value. The largest suppression occurs near the interface with BTO, with magnetization values of 50 kA/m, equivalent to 0.3 μB/Mn. FMR is observable at 8.9 GHz only around the [110] crystallographic direction in thin LCMO/BTO. The resonance barely shifts as the applied field is rotated away from [110]. The FMR results are analyzed in terms of magnetoelastic anisotropy and compared to LCMO/STO grown under the same conditions. A two-layer magnetization model is proposed, based on strong out-of-plane anisotropy near the BTO interface and shown to qualitatively explain the main characteristics of the FMR results.

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© 2013 American Physical Society. We thank María José Calderón for useful discussions. We acknowledge funding from the Spanish Ministry for Science and Innovation through Grants No. MAT2011-27470-C02-01, No. MAT2011-27470-C02-02, and No. CSD2009-00013. Work supported by the European Research Council Starting Grant No. ERC-259374-Sylo and by the Office of Basic Energy Science (BES), U.S. Department of Energy (DOE), BES-Department of Materials Science funded by the DOE’s Office of BES, Division of Materials Research under Grant No. DE FG03-87ER-45332 and Hungarian OTKA Grants K107228 and CNK80991. Los Alamos National Laboratory is operated by Los Alamos National Security LLC under DOE Contract No. DE-AC52-06NA25396.

Uncontrolled Keywords:Magnetic-anisotropy; Oxides.
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:31283
Deposited On:21 Jul 2015 09:37
Last Modified:10 Dec 2018 14:58

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