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Maria A. Torija, Manish Sharma, Jaume Gazquez, Maria Varela, Chunyong He, Josh Schmitt, Julie A. Borchers, Mark Laver, Sami El-Khatib and Chris Leighton Chemically Driven Nanoscopic Magnetic Phase Separation at the SrTiO3(001)/La1-xSrxCoO3 Interface Advanced Materials 23

Version of Record online: 20 APR 2011 | DOI: 10.1002/adma.201100417

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The degradation in magnetic properties in very thin film complex oxides is studied using SrTiO3(001)/La1-xSrxCoO3, providing unequivocal evidence for nanoscopic interfacial magnetic phase separation. Electron microscopy and spectroscopy reveal that this occurs due to inhomogeneity in local hole doping, driven by subtle, depthwise variations in the Sr and O stoichiometry. Simple thermodynamic and structural arguments for the origin of these variations are provided.

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