Abstract
Epitaxially grown Fe(110) layers on W(110) with thicknesses between 8 and 150 \AA{} have been investigated in situ by Brillouin scattering. Below 60 \AA{} a so-far-unobserved strong increase of the frequency of the Damon-Eshbach mode by a factor of up to 3 has been found with decreasing layer thickness. This novel behavior is described quantitatively by a model, which takes explicitly into account magnetic surface anisotropies. An additional growth-induced uniaxial magnetic surface anisotropy due to steps in the Fe layer could be identified.
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