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Title: Insight into spin transport in oxide heterostructures from interface-resolved magnetic mapping

At interfaces between complex oxides, electronic, orbital and magnetic reconstructions may produce states of matter absent from the materials involved, offering novel possibilities for electronic and spintronic devices. Here we show that magnetic reconstruction has a strong influence on the interfacial spin selectivity, a key parameter controlling spin transport in magnetic tunnel junctions. In epitaxial heterostructures combining layers of antiferromagnetic LaFeO3 (LFO) and ferromagnetic La0.7Sr0.3MnO3 (LSMO), we find that a net magnetic moment is induced in the first few unit planes of LFO near the interface with LSMO. Using X-ray photoemission electron microscopy, we show that the ferromagnetic domain structure of the manganite electrodes is imprinted into the antiferromagnetic tunnel barrier, endowing it with spin selectivity. Finally, we find that the spin arrangement resulting from coexisting ferromagnetic and antiferromagnetic interactions strongly influences the tunnel magnetoresistance of LSMO/LFO/LSMO junctions through competing spin-polarization and spin-filtering effects.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [5] ;  [2] ;  [6] ;  [5] ;  [5] ;  [1] ;  [5] ;  [1] ;  [1]
  1. Centre National de la Recherche Scientifique (CNRS)/Thales, Palaiseau (France). Unite Mixte de Physique and Univ. Paris-Sud, Orsay
  2. Helmholtz-Zentrum Berlin (HZB), (Germany). German Research Centre for Materials and Energy
  3. Univ. Complutense Madrid (Spain). Dept. Fisica Aplicada III; Unidad Asociada CSIC/Univ. Complutense Madrid (Spain). Lab. de Heterostructuras con aplicacion en Spintronica; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology
  4. Helmholtz-Zentrum Berlin (HZB), (Germany). German Research Centre for Materials and Energy; Ruhr Univ., Bochum (Germany). Inst. fuer Experimentalphysik/Festkoeperphysik
  5. Univ. Complutense Madrid (Spain). Dept. Fisica Aplicada III; Unidad Asociada CSIC/Univ. Complutense Madrid (Spain). Lab. de Heterostructuras con aplicacion en Spintronica
  6. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
Publication Date:
OSTI Identifier:
1265457
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE