MAGNETIC-BEHAVIOR OF PROBE LAYERS OF FE-57 IN THIN FE FILMS OBSERVED BY MEANS OF NUCLEAR RESONANT, SCATTERING OF SYNCHROTRON-RADIATION

The magnetic behavior of epitaxial probe layers of Fe-57 down to a thi ckness of 1 monolayer (ML) has been investigated with the technique of nuclear resonant scattering by synchrotron radiation (NRS) in a grazi ng: incidence geometry. The samples consisted of 10-55 ML Fe deposited onto a Ge(100) substrate and covered with 2 nm Au. Probe layers of 1- 10 ML Fe-57 were inserted at different depths in the Fe film. The tech nique yields spectroscopic information, i.e., magnetic hyperfine field s and isomer shifts, as well as structural information, such as layer thicknesses and interface roughness. The results show the existence of a nonmagnetic Ge/Fe interlayer of at least 10 ML thick after depositi on at room temperature. Subsequent conversion electron Mossbauer spect roscopy (CEMS) data show that, although the samples were stored at roo m temperature, the interlayer diffusion proceeds as a function of time . The relative merits of NRS and CEMS for the investigation of ultrath in layers are discussed.