Abstract
The structure and hyperfine magnetic properties of epitaxial Fe ultrathin films on a vicinal Pd(110) surface have been investigated by means of low-energy electron diffraction (LEED), reflection high-energy electron diffraction (RHEED) and $^{57}\mathrm{Fe}$ conversion electron M\ossbauer spectroscopy (CEMS). 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 Pd(110). This interpretation is supported by in situ $^{57}\mathrm{Fe}$ CEMS measurements which indicate an enhanced saturation hyperfine field of $\ensuremath{\sim}39\phantom{\rule{0.3em}{0ex}}\mathrm{T}$ 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 (face-centered tetragonal) Fe films on Pd(110) are in a ferromagnetic high-moment state with an enhanced hyperfine field due to electronic $3d\text{\penalty1000-\hskip0pt}4d$ hybridization at the Fe∕Pd interface.
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