@article{ bonell_spin-polarized_2012,
  title = {Spin-Polarized Electron Tunneling in bcc {FeCo/MgO/FeCo(001)} Magnetic Tunnel Junctions},
  volume = {108},
  issn = {0031-9007},
  doi = {10.1103/PhysRevLett.108.176602},
  abstract = {In combining spin-and symmetry-resolved photoemission, magnetotransport measurements and ab initio calculations we detangled the electronic states involved in the electronic transport in Fe1-{xCox(001)/MgO/Fe1-xCox(001)} magnetic tunnel junctions. Contrary to previous theoretical predictions, we observe a large reduction in {TMR} (from 530 to 200% at 20 K) for Co content above 25 atomic % as well as anomalies in the conductance curves. We demonstrate that these unexpected behaviors originate from a minority spin state with Delta(1) symmetry that exists below the Fermi level for high Co concentration. Using angle-resolved photoemission, this state is shown to be a two-dimensional state that occurs at both Fe1-{xCox(001)} free surface, and more importantly at the interface with {MgO.} The combination of this interface state with the peculiar density of empty states due to chemical disorder allows us to describe in details the complex conduction behavior in this system.},
  language = {English},
  number = {17},
  journal = {Physical Review Letters},
  author = {Bonell, F. and Hauet, T. and Andrieu, S. and Bertran, F. and Le Fevre, P. and Calmels, L. and Tejeda, A. and Montaigne, F. and Warot-Fonrose, B. and Belhadji, B. and Nicolaou, A. and Taleb-Ibrahimi, A.},
  month = {April},
  year = {2012},
  keywords = {co/mgo/co, large magnetoresistance, room-temperature, transfer-torque},
  pages = {176602}
}

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