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@ARTICLE{Spencer:848251,
      author       = {Spencer, Charles S. and Gayles, Jacob and Porter, Nicholas
                      A. and Sugimoto, Satoshi and Aslam, Zabeada and Kinane,
                      Christian J. and Charlton, Timothy R. and Freimuth, Frank
                      and Chadov, Stanislav and Langridge, Sean and Sinova, Jairo
                      and Felser, Claudia and Blügel, Stefan and Mokrousov, Yuriy
                      and Marrows, Christopher H.},
      title        = {{H}elical magnetic structure and the anomalous and
                      topological {H}all effects in epitaxial {B}20 {F}e 1 − y
                      {C}o y {G}e films},
      journal      = {Physical review / B},
      volume       = {97},
      number       = {21},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2018-03513},
      pages        = {214406},
      year         = {2018},
      abstract     = {Epitaxial films of the B20-structure compound Fe1−yCoyGe
                      were grown by molecular beam epitaxy on Si (111) substrates.
                      The magnetization varied smoothly from the bulklike values
                      of one Bohr magneton per Fe atom for FeGe to zero for
                      nonmagnetic CoGe. The chiral lattice structure leads to a
                      Dzyaloshinskii-Moriya interaction (DMI), and the films'
                      helical magnetic ground state was confirmed using polarized
                      neutron reflectometry measurements. The pitch of the spin
                      helix, measured by this method, varies with Co content y and
                      diverges at y∼0.45. This indicates a zero crossing of the
                      DMI, which we reproduced in calculations using
                      first-principles methods. We also measured the longitudinal
                      and Hall resistivity of our films as a function of magnetic
                      field, temperature, and Co content y. The Hall resistivity
                      is expected to contain contributions from the ordinary,
                      anomalous, and topological Hall effects. Both the anomalous
                      and topological Hall resistivities show peaks around
                      y∼0.5. Our first-principles calculations show a peak in
                      the topological Hall constant at this value of y, related to
                      the strong spin polarization predicted for intermediate
                      values of y. Our calculations predict half-metallicity for
                      y=0.6, consistent with the experimentally observed linear
                      magnetoresistance at this composition, and potentially
                      related to the other unusual transport properties for
                      intermediate value of y. While it is possible to reconcile
                      theory with experiment for the various Hall effects for
                      FeGe, the large topological Hall resistivities for y∼0.5
                      are much larger than expected when the very small emergent
                      fields associated with the divergence in the DMI are taken
                      into account.},
      cin          = {IAS-1 / PGI-1 / JARA-FIT / JARA-HPC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-1-20090406 / I:(DE-Juel1)PGI-1-20110106 /
                      $I:(DE-82)080009_20140620$ / $I:(DE-82)080012_20140620$},
      pnm          = {142 - Controlling Spin-Based Phenomena (POF3-142) / 143 -
                      Controlling Configuration-Based Phenomena (POF3-143) /
                      Topological transport in real materials from ab initio
                      $(jiff40_20090701)$ / Topological transport in real
                      materials from ab initio $(jara0062_20130501)$},
      pid          = {G:(DE-HGF)POF3-142 / G:(DE-HGF)POF3-143 /
                      $G:(DE-Juel1)jiff40_20090701$ /
                      $G:(DE-Juel1)jara0062_20130501$},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000434256300002},
      doi          = {10.1103/PhysRevB.97.214406},
      url          = {https://juser.fz-juelich.de/record/848251},
}