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@ARTICLE{Ibach:186713,
      author       = {Ibach, Harald},
      title        = {{H}igh resolution electron energy loss spectroscopy of spin
                      waves in ultra-thin film — {T}he return of the
                      adiabatic approximation?},
      journal      = {Surface science},
      volume       = {630},
      issn         = {0039-6028},
      address      = {Amsterdam},
      publisher    = {Elsevier},
      reportid     = {FZJ-2015-00785},
      pages        = {301 - 310},
      year         = {2014},
      abstract     = {The paper reports on recent considerable improvements in
                      electron energy loss spectroscopy (EELS) of spin waves in
                      ultra-thin films. Spin wave spectra with 4 meV resolution
                      are shown. The high energy resolution enables the
                      observation of standing modes in ultra-thin films in the
                      wave vector range of 0.15 Å− 1 < q|| < 0.3 Å− 1. In
                      this range, Landau damping is comparatively small and
                      standing spin wave modes are well-defined Lorentzians for
                      which the adiabatic approximation is well suited, an
                      approximation which was rightly dismissed by Mills and
                      collaborators for spin waves near the Brillouin zone
                      boundary. With the help of published exchange coupling
                      constants, the Heisenberg model, and a simple model for the
                      spectral response function, experimental spectra for
                      Co-films on Cu(100) as well as for Co films capped with
                      further copper layers are successfully simulated. It is
                      shown that, depending on the wave vector and film thickness,
                      the most prominent contribution to the spin wave spectrum
                      may come from the first standing mode, not from the
                      so-called surface mode. In general, the peak position of a
                      low-resolution spin wave spectrum does not correspond to a
                      single mode. A discussion of spin waves based on the
                      “dispersion” of the peak positions in low resolution
                      spectra is therefore subject to errors.},
      cin          = {PGI-6},
      ddc          = {540},
      cid          = {I:(DE-Juel1)PGI-6-20110106},
      pnm          = {422 - Spin-based and quantum information (POF2-422)},
      pid          = {G:(DE-HGF)POF2-422},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000344435900042},
      doi          = {10.1016/j.susc.2014.07.015},
      url          = {https://juser.fz-juelich.de/record/186713},
}