期刊
PHYSICAL REVIEW LETTERS
卷 106, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.147205
关键词
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资金
- Spanish MICINN [MAT 2008 06517]
- Consolider Ingenio [CSD2009-00013 (IMAGINE), CAM S2009-MAT 1756 (PHAMA)]
- Materials Sciences and Engineering Division, Office of Basic Energy Sciences, U.S. Department of Energy
- ERC [239739]
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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