We have investigated the effects of residual
gas impurity atoms on interlayer exchange coupling
and giant magnetoresistance (GMR) in Co(9Γ)/Cu(9Γ)
multilayers. Structural analysis was performed by Co(59)
NMR. We deposited sub-monolayer quantities of residual
gases at different points in the Co/Cu bilayer; the
interfaces, or the middle of the Cu spacers or CO magnetic
layers. Impurities at the interface lower the GMR
and increase remenant fraction and saturation field. We
are able to model these results phenomenologically by
adding biquadratic coupling. Impurities in the bulk of
the Cu layers lower GMR still further, and such samples
are well described by models containing almost
100% biquadratic coupling. We have demonstrated that
the ttansport parameters in our samples are largely
unaffected by small quantities of impurities, but that
the interlayer coupling is extremely sensitive to them,
particularly in the bulk of the Cu spacer layers
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