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@ARTICLE{Jayaraman:151850,
      author       = {Jayaraman, Rajeswari and Ibach, H. and Schneider, Claus
                      Michael},
      title        = {{S}tanding spin waves in ultrathin magnetic films: {A}
                      method to test for layer-dependent exchange coupling},
      journal      = {Physical review letters},
      volume       = {112},
      number       = {2014},
      issn         = {0031-9007},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2014-01708},
      pages        = {127202},
      year         = {2014},
      abstract     = {We introduce a method to test theoretical models for the
                      layer dependence of exchange coupling constants in ultrathin
                      magnetic films. The method is based on the observation of
                      high-energy and high-momentum standing spin wave modes using
                      high-resolution electron energy loss spectroscopy.
                      Experimental data are presented for 5–8 layers of fcc
                      cobalt deposited on Cu(100). The power of the method is
                      illustrated by comparison to two theoretical studies
                      predicting rather different results concerning the ratio of
                      the interlayer and intralayer exchange coupling constants
                      near the surface. Only the theory with a large interlayer
                      coupling shows sufficient energy spreading in the layer
                      dependence of the dispersion curves to match the
                      experimental data. We furthermore discuss the reason for the
                      surprising success of the simple nearest-neighbor Heisenberg
                      model with a single exchange constant matched to
                      experiment.},
      cin          = {PGI-6 / JARA-FIT},
      ddc          = {550},
      cid          = {I:(DE-Juel1)PGI-6-20110106 / $I:(DE-82)080009_20140620$},
      pnm          = {422 - Spin-based and quantum information (POF2-422)},
      pid          = {G:(DE-HGF)POF2-422},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000333920000030},
      doi          = {10.1103/PhysRevLett.112.127202},
      url          = {https://juser.fz-juelich.de/record/151850},
}