Electronic and Magnetic Reconstructions in La0.7Sr0.3MnO3/SrTiO3 Heterostructures: A Case of Enhanced Interlayer Coupling Controlled by the Interface
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2011
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American Physical Society
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Bruno, F.Y., Garcia-Barriocanal, J., Varela, M., Nemes, N.M., Thakur, P., Cezar, J.C., Brookes, N.B., Rivera-Calzada, A., Garcia-Hernandez, M., Leon, C., Okamoto, S., Pennycook, S.J., Santamaria, J.: Electronic and Magnetic Reconstructions in La 0.7 Sr 0.3 MnO 3 / SrTiO 3 Heterostructures: A Case of Enhanced Interlayer Coupling Controlled by the Interface. Phys. Rev. Lett. 106, 147205 (2011). https://doi.org/10.1103/PhysRevLett.106.147205
Abstract
We report on the magnetic coupling of La0.7Sr0.3MnO3 layers through SrTiO3 spacers in La0.7Sr0.3MnO3/SrTiO3 epitaxial heterostructures. Combined aberration-corrected microscopy and electron-energy-loss spectroscopy evidence charge transfer to the empty conduction band of the titanate. Ti d electrons interact via superexchange with Mn, giving rise to a Ti magnetic moment as demonstrated by x-ray magnetic circular dichroism. This induced magnetic moment in the SrTiO3 controls the bulk magnetic and transport properties of the superlattices when the titanate layer thickness is below 1 nm.