Enhanced hyperfine magnetic fields for face-centered tetragonal Fe(110) ultrathin films on vicinal Pd(110)

    Authors

    B. R. Cuenya; W. Keune; D. Q. Li;S. D. Bader

    Comments

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    Abbreviated Journal Title

    Phys. Rev. B

    Keywords

    ENERGY ELECTRON-DIFFRACTION; FE FILMS; MOSSBAUER-SPECTROSCOPY; FCC FE; CIRCULAR-DICHROISM; FE/PD MULTILAYERS; SURFACE MAGNETISM; PALLADIUM-IRON; FE(001) FILMS; THIN-FILMS; Physics, Condensed Matter

    Abstract

    The structure and hyperfine magnetic proper-ties 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 Fe-57 conversion electron Mossbauer 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 Fe-57 CEMS measurements which indicate an enhanced saturation hyperfine field of similar to 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 (face-centered tetragonal) Fe films on Pd(110) are in a ferromagnetic high-moment state with an enhanced hyperfine field due to electronic 3d-4d hybridization at the Fe/Pd interface.

    Journal Title

    Physical Review B

    Volume

    71

    Issue/Number

    6

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    9

    WOS Identifier

    WOS:000228013500043

    ISSN

    1098-0121

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