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A double-layer structure consisting of Fe on amorphous Tb/sub 20/Fe/sub 80/ has been investigated with spin-polarized photoemission as function of the thickness of the Fe film. For 40 AA no exchange coupling to the underlying TbFe is observed, whereas at 30 AA and less the TbFe magnetization affects significantly the magnetization of the Fe overlayer. Even for a 10-AA Fe film the vast majority of the photoelectrons is shown to originate from this layer.>
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Aeschlimann et al. (1988) studied this question.
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