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@ARTICLE{Li:189242,
      author       = {Li, Zi-An and Fontaíña-Troitiño, N. and Kovács, A. and
                      Liébana-Viñas, S. and Spasova, M. and Dunin-Borkowski,
                      Rafal and Müller, M. and Doennig, D. and Pentcheva, R. and
                      Farle, M. and Salgueiriño, V.},
      title        = {{E}lectrostatic doping as a source for robust
                      ferromagnetism at the interface between antiferromagnetic
                      cobalt oxides},
      journal      = {Scientific reports},
      volume       = {5},
      issn         = {2045-2322},
      address      = {London},
      publisher    = {Nature Publishing Group},
      reportid     = {FZJ-2015-02430},
      pages        = {7997},
      year         = {2015},
      abstract     = {Polar oxide interfaces are an important focus of research
                      due to their novel functionality which is not available in
                      the bulk constituents. So far, research has focused mainly
                      on heterointerfaces derived from the perovskite structure.
                      It is important to extend our understanding of electronic
                      reconstruction phenomena to a broader class of materials and
                      structure types. Here we report from high-resolution
                      transmission electron microscopy and quantitative
                      magnetometry a robust – above room temperature (Curie
                      temperature TC ≫ 300 K) – environmentally stable-
                      ferromagnetically coupled interface layer between the
                      antiferromagnetic rocksalt CoO core and a 2–4 nm thick
                      antiferromagnetic spinel Co3O4 surface layer in
                      octahedron-shaped nanocrystals. Density functional theory
                      calculations with an on-site Coulomb repulsion parameter
                      identify the origin of the experimentally observed
                      ferromagnetic phase as a charge transfer process (partial
                      reduction) of Co3+ to Co2+ at the CoO/Co3O4 interface, with
                      Co2+ being in the low spin state, unlike the high spin state
                      of its counterpart in CoO. This finding may serve as a
                      guideline for designing new functional nanomagnets based on
                      oxidation resistant antiferromagnetic transition metal
                      oxides.},
      cin          = {PGI-5},
      ddc          = {000},
      cid          = {I:(DE-Juel1)PGI-5-20110106},
      pnm          = {143 - Controlling Configuration-Based Phenomena (POF3-143)},
      pid          = {G:(DE-HGF)POF3-143},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000348287500018},
      pubmed       = {pmid:25613569},
      doi          = {10.1038/srep07997},
      url          = {https://juser.fz-juelich.de/record/189242},
}