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

L. Pleth Nielsen, I. Stensgaard, F. Besenbacher and E. Lægsgaard
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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

Surface Review and Letters (SRL), 1996, vol. 03, issue 05n06, 1713-1719

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.

Date: 1996
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DOI: 10.1142/S0218625X96002655

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