MAGNETIC-POLARIZATION IN AU LAYERS OF AU M (M = FE, CO, AND NI) MULTILAYERS WITH SN-119 PROBES STUDIED BY MOSSBAUER-SPECTROSCOPY/

Magnetic polarization of Au layers in Au/M (M = Fe, Co, and Ni) metall ic multilayers are studied by Sn-119 Mossbauer spectroscopy. Sn-119 Mo ssbauer probes are embedded in the Au layers of Au/M multilayers which are made by ultra-high vacuum evaporation. Sn-119 Mossbauer spectra o f all Au/M multilayers show magnetic hyperfine fields though the magni tude is different among these three systems, which indicates that the Au layers are magnetically polarized by the ferromagnetic layers. When Au layer thickness is thin, the Sn-119 probes in the Au/Co multilayer s experience the largest hyperfine field. From the Mossbauer spectra w ith applied fields at 5 K, the direction of the hyperfine field is det ermined to be both parallel and antiparallel to the applied field dire ction, suggesting the oscillatory behavior of the magnetic polarizatio n of the Au layer conduction electrons. (C) 1998 Elsevier Science B.V. All rights reserved.