EU-151 MOSSBAUER STUDY OF TRANSITION-METAL EU MULTILAYERS

The magnetic properties of TM/Eu (TM = V, Cr, Fe, Co, Ni, Cu, and Nb) multilayers have been studied by Fe-57 and Eu-151 Mossbauer measuremen ts at 4.2 and 300 K. The Fe-57 Mossbauer spectra at 4.2 and 300 K of t he Fe/Eu multilayers were fitted with two components: one with hyperfi ne parameters typical of bulk alpha-Fe, and the other one with a reduc ed magnetic hyperfine field, which is attributed to the interface regi on. The Eu-151 Mossbauer spectra of TM/Eu at 4.2 K were similarly anal yzed with two components: component A with hyperfine parameters simila r to bulk Eu metal, and component B with a reduced magnetic hyperfine field. Variation of the Eu layer thickness for the systems Fe/Eu and V /Eu showed an enhancement of component B relative to component A with decreasing Eu layer thickness, supporting the analysis with two compon ents given above. The latter component is attributed to the interface region. Possible explanations for the reduction of the magnetic hyperf ine field of component B are discussed.