High-energy phonon confinement in nanoscale metallic multilayers.
The Fe-projected vibrational density of states g(E) in nanoscale {sup 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.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF); DFG
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 927767
- Report Number(s):
- ANL/XSD/JA-61625; TRN: US0804819
- Journal Information:
- Phys. Rev. B, Vol. 77, Issue 2008; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- ENGLISH
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