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Electronic and magnetic reconstructions in La0.7Sr0.3MnO3/SrTiO3 heterostructures: a case of enhanced interlayer coupling controlled by the interface. | LitMetric
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Electronic and magnetic reconstructions in La0.7Sr0.3MnO3/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

Phys Rev Lett

GFMC, Departamento Física Aplicada III, Universidad Complutense de Madrid, Campus Moncloa, 28040 Madrid, Spain.

Published: April 2011

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.

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http://dx.doi.org/10.1103/PhysRevLett.106.147205DOI Listing

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