Abstract
A Green's function formalism is used to calculate the spectrum of
localized modes of an impurity layer implanted within a ferromagnetic
thin film. The equations of motion for the Green's functions are
determined in the framework of the Ising model in a transverse field. We
show that depending on the thickness, exchange and effective field
parameters, there is a ``crossover'' effect between the surface modes
and impurity localized modes. For thicker films the results show that
the degeneracy of the surface modes can be lifted by the presence of an
impurity layer. (C) 2004 Elsevier B.V. All rights reserved.
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