Publication Type:Journal Article
Source:Physical Review Letters, Volume 105, Number 25 (2010)
Keywords:Applied magnetic fields, Dichroism, Epitaxial growth, LSMO films, Magnetic configuration, Magnetic fields, Magnetic state, Magnetic thick films, Manganese, Manganese oxide, Scattering measurements, spectroscopy, Strontium, strontium titanate, Strontium titanates, Surface normal directions, X-ray magnetic circular dichroism
We present an unreported magnetic configuration in epitaxial La 1-xSrxMnO3 (x∼0.3) (LSMO) films grown on strontium titanate (STO). X-ray magnetic circular dichroism indicates that the remanent magnetic state of thick LSMO films is opposite to the direction of the applied magnetic field. Spectroscopic and scattering measurements reveal that the average Mn valence varies from mixed Mn3⊃+/Mn4⊃+ to an enriched Mn3⊃+ region near the STO interface, resulting in a compressive lattice along the a, b axis and a possible electronic reconstruction in the Mn e g orbital (d3z2-r2). This reconstruction may provide a mechanism for coupling the Mn3⊃+ moments antiferromagnetically along the surface normal direction, and in turn may lead to the observed reversed magnetic configuration. © 2010 The American Physical Society.
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