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Buried Ni/Cu(001) interface at the atomic scale.

H L Meyerheim1, D Sander, N N Negulyaev

  • 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany. hmeyerhm@mpi-halle.mpg.de

Physical Review Letters
|June 4, 2008
PubMed
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We studied the nickel-copper interface using X-ray analysis, finding significant mixing. Atomic simulations explain this intermixing, revealing nickel atoms disperse within copper with specific spacing.

Area of Science:

  • Materials Science
  • Surface Science
  • Condensed Matter Physics

Background:

  • Understanding buried interfaces is crucial for designing advanced materials.
  • The nickel-copper (Ni/Cu) system is a model for studying interface phenomena.

Purpose of the Study:

  • To quantitatively analyze the structure of the buried Ni/Cu(001) interface.
  • To investigate the mechanism and extent of interface mixing.
  • To elucidate the kinetic pathway of nickel-copper exchange.

Main Methods:

  • Quantitative surface X-ray analysis.
  • Atomic scale simulations.
  • Deposition of 3 and 5 monolayers of Ni on Cu(001) at room temperature.

Main Results:

Related Experiment Videos

  • Observed 27+/-10% exchange of top Cu layer atoms with Ni.
  • Atomic simulations revealed a kinetic pathway for Ni/Cu exchange.
  • Determined a disperse distribution of Ni within the Cu surface.
  • Identified preferential Ni-Ni separation of 3-4 nearest neighbor distances.

Conclusions:

  • Interface mixing occurs at the Ni/Cu(001) interface.
  • The observed limited intermixing is explained by the kinetic pathway.
  • The spatial distribution of Ni atoms influences interface properties.