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Exotic magnetic anisotropy map in epitaxial La_(0.7)Ca_(0.3)MnO_(3) films on BaTiO_(3)

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Nemes, Norbert Marcel and Tornos, J. and León Yebra, Carlos and Santamaría Sánchez-Barriga, Jacobo (2011) Exotic magnetic anisotropy map in epitaxial La_(0.7)Ca_(0.3)MnO_(3) films on BaTiO_(3). Physical review B, 84 (13). ISSN 1098-0121

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Official URL: http://dx.doi.org/10.1103/PhysRevB.84.134402


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Abstract

We report the observation between 40 and 120 K of anomalous magnetic hysteresis loops in thin epitaxial films of La_(0.7)Ca_(0.3)MnO_(3) grown on ferroelectric BaTiO_(3). These hysteresis loops display extremely unusual features: after switching at coercivity, the magnetization overshoots the eventual high-field value. We study the strains in the film and substrate with x-ray diffraction and propose a model of two magnetic moment populations with different magnetoelastic anisotropies. The relative weights of both populations can be estimated by comparison with twin samples of La_(0.7)Ca_(0.3)MnO_(3) films on nonferroelectric SrTiO_(3). We propose that the observed magnetization overshoots the result from differences in the magnetostriction balance as the applied magnetic field increases. The picture of a nonuniform strain field in La_(0.7)Ca_(0.3)MnO_(3) on BaTiO_(3), caused by the corrugation of the ferroelectric domains in the rhombohedric phase of BaTiO_(3), is compatible with the magnetic granular behavior observed in the temperature and field dependences of the magnetization as well as in the low temperature magnetoresistance exhibited by the epitaxial film.


Item Type:Article
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© 2011 American Physical Society. Artículo firmado por 13 autores. We acknowledge financial support from MICINN grants MAT2008-06517-C02-01, CSD2009-00013, MAT2008-06517-C02-02, and PI2010-60E013 and provision of beamtime by the European Synchrotron Radiation Facility.

Uncontrolled Keywords:Thin-films; Tunnel-junctions; Strain; Magnetoresistance; Heterostructures; Temperature; Dependence; Stress.
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
ID Code:30113
Deposited On:18 May 2015 09:15
Last Modified:10 Dec 2018 14:58

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