Abstract
We obtain the magnetic susceptibility of systems constituted of two
coupled magnetic layers. We consider that the coupling of the films is
well described by a Heisenberg like interaction to write the equation of
motion for the magnetization of each part of the system. The dynamical
response of each constituent material is calculated taking into account
the presence of an interacting magnetic media (a magnetic layer) in its
border. The susceptibility obtained incorporates the effects of a
different magnetic film in the neighborhood (via the interfilm
interaction), as well as the properties of the interface We use a
procedure similar to the effective medium approach developed for
superlattices to obtain an effective magnetic permeability for the whole
system We show that the knowledge of this property allows one to have
information on the interface of the magnetic bilayer through the
analysis of its optical properties. We illustrate this point by
calculating the dispersion relation of magnetic polaritons propagating
in a system consisting of an antiferromagnetic (MnF2) layer grown in
direct contact with a ferromagnetic film (Fe). We also simulate
numerically an optical experiment where ATR (Attenuated Total
Reflection) spectra are obtained (C) 2010 Elsevier Ltd. All rights
reserved.
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