Abstract
Behavior of dipole-exchange spin waves (SWs) in the Damon-Eshbach geometry in a nanocomposite ${({\text{SiO}}_{2})}_{100\ensuremath{-}x}{\text{Co}}_{x}$ superferromagnetic $(x=80\text{ }\text{at}\text{.}\text{ }%)$ film has been studied by Brillouin light scattering. The measured value of the effective exchange constant turned out to be three times less than its value for the bulk cobalt. A qualitative theoretical model has been proposed to explain this reduction. It has been shown that the ``superspin'' approximation, identifying each nanoparticle with a ``magnetic point'' with no internal structure, is not sufficient to account for the description of the SW behavior of a concentrated nanocomposite medium.
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