Journal
PHYSICAL REVIEW B
Volume 88, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.134410
Keywords
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Funding
- Spanish Ministry for Science and Innovation [MAT2011-27470-C02-01, MAT2011-27470-C02-02, CSD2009-00013]
- European Research Council [ERC-259374-Sylo]
- Office of Basic Energy Science (BES), U.S. Department of Energy (DOE), BES-Department of Materials Science
- DOE's Office of BES, Division of Materials Research [DE FG03-87ER-45332]
- Hungarian OTKA [K107228, CNK80991]
- Los Alamos National Security LLC under DOE [DE-AC52-06NA25396]
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The magnetism of La0.7Ca0.3MnO3 (LCMO) epitaxial thin films grown on SrTiO3 (STO) and BaTiO3 (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 mu B/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 mu B/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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