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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 y Tornos, J. y León Yebra, Carlos y 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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URL Oficial: http://dx.doi.org/10.1103/PhysRevB.84.134402

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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.

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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.

Palabras clave:Thin-films; Tunnel-junctions; Strain; Magnetoresistance; Heterostructures; Temperature; Dependence; Stress.
Materias:Ciencias > Física > Electricidad
Ciencias > Física > Electrónica
Código ID:30113
Depositado:18 May 2015 09:15
Última Modificación:05 Jul 2018 16:27

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