High-energy phonon confinement in nanoscale metallic multilayers

    Authors

    B. R. Cuenya; W. Keune; R. Peters; E. Schuster; B. Sahoo; U. von Horsten; W. Sturhahn; J. Zhao; T. S. Toellner; E. E. Alp;S. D. Bader

    Comments

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    Abbreviated Journal Title

    Phys. Rev. B

    Keywords

    NUCLEAR RESONANT SCATTERING; DENSITY-OF-STATES; SYNCHROTRON-RADIATION; FILM STRUCTURES; SUPERLATTICES; INTERFACE; FE; MODES; ROUGHNESS; LATTICE; Physics, Condensed Matter

    Abstract

    The Fe-projected vibrational density of states g(E) in nanoscale (57)Fe/M multilayers, where M=Cr, Co, Cu, Pd, or Ag was measured by nuclear resonant inelastic x-ray scattering. With decreasing Fe thickness, the high-energy phonon peak of Fe near 36 meV is suppressed for the "soft" metals Ag, Pd, and Cu, but much less so for the "hard" metals Co and Cr. This effect is attributed to Fe phonon confinement and interface localization due to an energy mismatch between g(E) of M and of Fe.

    Journal Title

    Physical Review B

    Volume

    77

    Issue/Number

    16

    Publication Date

    1-1-2008

    Document Type

    Article

    Language

    English

    First Page

    6

    WOS Identifier

    WOS:000255457500108

    ISSN

    1098-0121

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