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@ARTICLE{Michel:280533,
      author       = {Michel, E. and Ibach, H. and Schneider, C. M.},
      title        = {{S}pin waves in ultrathin hexagonal cobalt films on
                      {W}(110), {C}u(111), and {A}u(111) surfaces},
      journal      = {Physical review / B},
      volume       = {92},
      number       = {2},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2016-00301},
      pages        = {024407},
      year         = {2015},
      abstract     = {Spin wave spectra of ultrathin epitaxial cobalt films
                      deposited on W(110), Cu(111), and Au(111) surfaces are
                      studied in the wave-vector regime between 0.1Å−1 and
                      0.7Å−1 using inelastic electron scattering with 6 meV
                      energy resolution. Up to three different spin wave modes are
                      resolved for wave vectors q∥<0.35Å−1. The modes are
                      identified as the acoustic mode and standing modes with one
                      and two nodes inside the film. The relative weight of the
                      modes in a particular spectrum may depend critically on the
                      electron impact energy. For larger wave vectors beyond
                      q∥>0.35Å−1 and layers thicker than five atom layers the
                      separate modes merge into a single, broad loss feature.
                      Since the shape and position of the loss feature depend on
                      the electron impact energy, a separation into different
                      modes is nevertheless possible for not too large wave
                      vectors. The spin wave dispersion curves of films grown on
                      W(110) agree with those observed on Cu(111) if one takes
                      into account that on copper the cobalt grows in islands so
                      that the mean height of the islands is higher than the
                      nominal coverage. On films grown on Au(111) the low wave
                      vector spin waves are buried in the high elastic diffuse
                      scattering caused by the considerable disorder in the films.
                      The broader appearance of the spectra at higher wave vectors
                      compared to films grown on W(110) and Cu(111) is
                      quantitatively accounted for by disorder-induced kinematic
                      broadening. Because of the granular growth on copper and
                      gold primarily the spin wave spectrum of cobalt films on
                      W(110) is amenable to quantitative theoretical analysis.
                      Such an analysis is not available at present. We show
                      however, that the dispersion curves are incompatible with
                      the Heisenberg model as long as only a single,
                      layer-independent exchange coupling constant is invoked.},
      cin          = {PGI-6},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-6-20110106},
      pnm          = {522 - Controlling Spin-Based Phenomena (POF3-522)},
      pid          = {G:(DE-HGF)POF3-522},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000357635100002},
      doi          = {10.1103/PhysRevB.92.024407},
      url          = {https://juser.fz-juelich.de/record/280533},
}