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
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2011
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American Physical Society
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Abstract
We report on the magnetic coupling of La_(0.7)Sr_(0.3)MnO_(3) layers through SrTiO_(3) spacers in La_(0.7)Sr_(0.3)MnO_(3)/SrTiO_(3) 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 SrTiO_(3) controls the bulk magnetic and transport properties of the superlattices when the titanate layer thickness is below 1 nm.
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© 2011 American Physical Society. Este artículo está firmado por 13 autores. Work at UCM was supported by Spanish MICINN Grant No. MAT 2008 06517, Consolider Ingenio CSD2009- 00013 (IMAGINE), and CAM S2009-MAT 1756 (PHAMA). Work at ORNL was supported by the Materials Sciences and Engineering Division, Office of Basic Energy Sciences, U.S. Department of Energy. M. V. acknowledges ERC starting Grant No. 239739 STEMOX.