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@ARTICLE{Yang:17482,
      author       = {Yang, S.-H. and Balke, B. and Papp, Ch. and Doering, S. and
                      Berges, U. and Plucinski, L. and Westphal, C. and Schneider,
                      C. M. and Parkin, S. S. P. and Fadley, C. S.},
      title        = {{D}etermination of layer-resolved composition,
                      magnetization, and electronic structure of an {F}e/{M}g{O}
                      tunnel junction by standing-wave core and valence
                      photoemission},
      journal      = {Physical review / B},
      volume       = {84},
      number       = {18},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-17482},
      pages        = {184410},
      year         = {2011},
      note         = {B.B. and C.P. gratefully acknowledge the support through
                      the Feodor-Lynen fellowship of the Humboldt foundation. C.F.
                      also acknowledges support of the Helmholtz Association and
                      the Humboldt Foundation. Additionally, the experiments at
                      the Advanced Light Source and the participation of LBNL
                      Materials Sciences Division scientists were supported by
                      Department of Energy (DOE) Contract No. DE-AC02-05CH11231.},
      abstract     = {Spin-dependent tunneling across a highly textured MgO
                      insulating barrier has received much attention due to its
                      potential applications in various spintronic devices.
                      However, the interfacial magnetic and electronic structure
                      of a prototypical realization of this in Fe/MgO/Fe and the
                      effective band gap of the MgO layer are still under debate.
                      In order to resolve these issues, we have employed
                      standing-wave excited core and valence photoemission, as
                      well as core-level magnetic circular dichroism (MCD) in
                      photoemission, to study the Fe/MgO interface with
                      subnanometer depth resolution. For our synthetic procedure,
                      we show that the Fe/MgO interface is linearly intermixed in
                      composition over a length of similar to 8 angstrom (similar
                      to 4 monolayers) and that there is a magnetic dead layer
                      similar to 2-3 angstrom thick. The unambiguous extraction of
                      depth-resolved density of states (DOS) reveals that the
                      interfacial layer composition is mostly metallic and
                      nonmagnetic FeOx, with x congruent to 1, which accounts for
                      a smaller magnetoresistance compared to theoretical
                      predictions. The formation of the magnetic dead layer (FeO)
                      at the interface should also reduce the tunneling spin
                      polarization. The analysis of our data also shows a clear
                      valence band edge of ultrathin MgO layer at similar to 3.5
                      eV below the Fermi level (E-F) that is very close to that of
                      single crystal bulk MgO. An analysis that does not consider
                      the interdiffused region separately exhibits the valence
                      band edge for MgO layer similar to 1.3 eV below E-F, which
                      is significantly closer to the MgO barrier height estimated
                      from magnetotransport measurements and further suggests that
                      the Fe/MgO interdiffusion effectively reduces the MgO band
                      gap.},
      keywords     = {J (WoSType)},
      cin          = {PGI-6},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-6-20110106},
      pnm          = {Grundlagen für zukünftige Informationstechnologien},
      pid          = {G:(DE-Juel1)FUEK412},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000296911600004},
      doi          = {10.1103/PhysRevB.84.184410},
      url          = {https://juser.fz-juelich.de/record/17482},
}