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COMBINED STM AND RBS INVESTIGATION OF THE NUCLEATION AND GROWTH OFAuONNi(110): ALLOYING AND DEALLOYING

Author

Listed:
  • L. PLETH NIELSEN

    (Center for Atomic-Scale Materials Physics and Institute of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark)

  • I. STENSGAARD

    (Center for Atomic-Scale Materials Physics and Institute of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark)

  • F. BESENBACHER

    (Center for Atomic-Scale Materials Physics and Institute of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark)

  • E. LÆGSGAARD

    (Center for Atomic-Scale Materials Physics and Institute of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark)

Abstract

We have performed in-situ Scanning Tunneling Microscopy (STM) and Rutherford Backscattering Spectroscopy (RBS) investigations of the room-temperature (RT) growth of Au onNi(110). At low coverages, we observe the formation of aAu/Nisurface alloy, even though Au is immiscible with bulk Ni at RT. At a critical Au coverage ofθAu= 0.4 ML(monolayer), we observe a “dealloying” phase transition where 0.16 ML of Au is “popping” out of the alloyed surface layer and nucleates into [001]-directed dimer/trimer Au chains. Increasing the Au coverage further causes the nucleation and growth of more [001]-directed chains, i.e. their mutual distance in the$[1$\bar 1$0]$direction decreases until the chain structure finally saturates in ap(5 × 3)structure atθAu= 0.93ML. The formation of a surface alloy at low coverage is supported by theoretical calculations within the Effective-Medium Theory (EMT), and an atomic model for the [001]-directed Au chains is developed from a detailed interplay between experiments and theoretical calculations.

Suggested Citation

  • L. Pleth Nielsen & I. Stensgaard & F. Besenbacher & E. Lægsgaard, 1996. "COMBINED STM AND RBS INVESTIGATION OF THE NUCLEATION AND GROWTH OFAuONNi(110): ALLOYING AND DEALLOYING," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 3(05n06), pages 1713-1719.
    • Handle: RePEc:wsi:srlxxx:v:03:y:1996:i:05n06:n:s0218625x96002655
    DOI: 10.1142/S0218625X96002655
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