Enhanced hyperfine magnetic fields for face-centered tetragonal Fe(110) ultrathin films on vicinal Pd(110)
نویسندگان
چکیده
The structure and hyperfine magnetic properties of epitaxial Fe ultrathin films on a vicinal Pds110d surface have been investigated by means of low-energy electron diffraction sLEEDd, reflection high-energy electron diffraction sRHEEDd and Fe conversion electron Mössbauer spectroscopy sCEMSd. LEED and RHEED provide evidence for initial pseudomorphic film growth. The RHEED determination of the in-plane atomic distance versus Fe film thickness demonstrates the stabilization of the metastable fcc-like Fe structure on Pds110d. This interpretation is supported by in situ Fe CEMS measurements which indicate an enhanced saturation hyperfine field of ,39 T for a 3-monolayers-thick Fe film at 25 K. This is the highest value ever measured for Fe on a metallic substrate. Our results suggest that ultrathin fcc-like sface-centered tetragonald Fe films on Pds110d are in a ferromagnetic high-moment state with an enhanced hyperfine field due to electronic 3d-4d hybridization at the Fe/Pd interface.
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