Abstract
Co/Cu superlattices were prepared by changing the Ar acceleration voltage (VB) in ion beam sputtering. VB dependence on the nanostructure of the interface alloy regions has been deduced from the 59Co nuclear magnetic resonance (NMR) spin-echo spectrum, and the correlation between the magnetoresistance (MR) ratio and interface structure was investigated. The results have shown that there is a correlation between the interlayer interaction and the interface chemical structure. The Co average fractions in the interface alloy regions are nearly uniform and equal to 50 at.% for superlattices having small Δρ, and distributed for superlattices having large Δρ. Moreover, the local strain from the shift in the hyperfine field has been found to be correlated with the Co uniaxial anisotropy constant due to the strain from the epitaxial growth on Cu.
