SPATIAL MODULATION OF THE MAGNETIC-MOMENT IN CO PD SUPERLATTICES OBSERVED BY POLARIZED NEUTRON REFLECTIVITY/

We have measured the specular reflectivity of spin-polarized neutrons from two (111) superlattices, [Pd 80 angstrom\Co 60 angstrom] x 20/Pd 300 angstrom/Co 10 angstrom/GaAs and [Pd 53 angstrom\Co 32 angstrom]x 10/Pd 30 angstrom/Cu 354 angstrom/Si, grown by molecular-beam epitaxy. In a saturating field of 2300 Oe, we extract for the first superlatti ce a Co moment value of corresponding to 78% of the bulk Co moment. At temperatures ranging from 38 to 295 K, no excess magnetic moment from polarization of the Pd atoms is evident in the nominal Pd layer. Comp arable reflectivity data from the second sample support these conclusi ons.