Magnetic interlayer coupling between Co films across Cu/Ni30Cu70/Cu(100) double quantum wells

Magnetic interlayer coupling between two Co layers across Cu/Ni-30/Cu-70/Cu (100) was investigated by the surface magneto-optic Kerr effect. The Ni30Cu 70 layer at the center of the Cu layer was shown to shift the peak position s, rather than to change the strength, of the magnetic interlayer coupling. The density of states near the Fermi level was investigated by photoemissi on spectroscopy. We show that the peak-position shift in the magnetic inter layer coupling is associated with the quantum-well behavior in a symmetric double-quantum-well system. The phase accumulation model was applied to exp lain the results quantitatively.