Abstract
The spatially oscillating spin polarization in Cu layers in the system of [Ni/Cu] superlattices has been investigated by means of pulsed NMR methods. On increasing the Cu layer thickness with the Ni layer thickness unchanged, the obtained NMR spectra become narrower. This narrowing gives us information on the shape of the spin polarization oscillation as a function of the distance from the ferromagnetic interface. Moreover, the shapes of the spectra vary noticeably with the change in the angle between the interface planes and the external field. This angular dependence is a unique feature of superlattice systems, which is not observed in bulk materials. It offers information on the electronic states in the Cu layers, which characterize the observed long-period oscillation of the exchange coupling between ferromagnetic layers.
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