Electronic and magnetic reconstructions in La0.7Sr 0.3MnO3/SrTiO3 heterostructures: A case of enhanced interlayer coupling controlled by the interface

F. Y. Bruno, J. Garcia-Barriocanal, M. Varela, N. M. Nemes, P. Thakur, J. C. Cezar, N. B. Brookes, A. Rivera-Calzada, M. Garcia-Hernandez, C. Leon, S. Okamoto, S. J. Pennycook, J. Santamaria

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Abstract

We report on the magnetic coupling of La0.7Sr 0.3MnO3 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 1μnm.

Original languageEnglish (US)
Article number147205
JournalPhysical review letters
Volume106
Issue number14
DOIs
StatePublished - Apr 8 2011

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