| Popis: |
The magnetic properties of TM/Eu (TM5V, Cr, Fe, Co, Ni, Cu, and Nb) multilayers have been studied by 57Fe and 151Eu Mo¨ssbauer measurements at 4.2 and 300 K. The 57Fe Mo¨ssbauer spectra at 4.2 and 300 K of the Fe/Eu multilayers were fitted with two components: one with hyperfine parameters typical of bulk a-Fe, and the other one with a reduced magnetic hyperfine field, which is attributed to the interface region. The 151Eu Mo¨ssbauer spectra of TM/Eu at 4.2 K were similarly analyzed with two components: component A with hyperfine parameters similar 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 components given above. The latter component is attributed to the interface region. Possible explanations for the reduction of the magnetic hyperfine field of component B are discussed. |
