THE MAGNETIC COUPLING, OPTICAL AND MAGNETOOPTICAL PROPERTIES OF OSCILLATION OBSERVED IN SPUTTERED CO-AL CU MULTILAYERS/

We have studied the optical and magneto-Optical properties, and the be havior of interlayer coupling and magnetoresistance in sputtered [Co90 Al10(1.6 nm)/Cu](30) multilayers. It is found that for Co-Al/Cu multil ayers, the magnetoresistance ratio Delta R/R, the in-plane saturation field H-s and coercive force H-c oscillate with a period of about 0.9 nm, as a function of the Cu layer thickness. It is significant to find that the magneto-Optical polar Kerr rotation theta(K), and particular ly the effective dielectric constant epsilon oscillate in a period of about 0.9 nm. This result can be attributed to the oscillations of the optical constants in Cu spacer layers, induced by the oscillatory int erlayer coupling or quantum well effect. Numerical calculations show t hat the oscillations of the effective optical constants play an import ant role in the magneto-Optical Kerr effect oscillations.