July 2011

Journal

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

By:
Bruno, Flavio; Garcia-Barriocanal, Javier; Varela Del Arco, Maria ; Nemes, Norbert; Thakur, P.; Cezar, J.; Rivera-Calzada, Alberto; Garcia-Hernandez, M; Leon, C.; Okamoto, Satoshi ; Pennycook, Stephen J; Santamaria, J.
Journal Name:
Physical Review Letters
Page Number:
147205
Volume:
106
Issue Number:
14
Publication Date:
July 2011
View DOI Listing:
https://doi.org/10.1103/PhysRevLett.106.147205

Abstract

We examined the electronic reconstruction that occurs at the LSMO/STO interface on epitaxial superlattices by combined magnetotransport measurements, aberration corrected microscopy and x-ray magnetic circular dichroism. We have found a reduced Ti oxidation state resulting from charge transfer at the interface. XMCD evidences magnetic moment at the Ti originated at the superexchange interaction with Mn. This induced magnetic moment at STO controls the bulk magnetic and transport properties of the superlattices when the titanate layer thickness is below 1 nm.


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