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Growth of Epitaxial Co Layers on Sb-Passivated GaAs(110) Substrates

Author

Listed:
  • C. M. Teodorescu

    (LURE, Bât. 209d, Centre Universitaire Paris Sud, 91405, Orsay, France)

  • J. Chrost

    (LURE, Bât. 209d, Centre Universitaire Paris Sud, 91405, Orsay, France)

  • H. Ascolani

    (Instituto de Ciencia de Materiales de Madrid, CSIC, Madrid, Spain)

  • J. Avila

    (LURE, Bât. 209d, Centre Universitaire Paris Sud, 91405, Orsay, France)

  • F. Soria

    (Instituto de Ciencia de Materiales de Madrid, CSIC, Madrid, Spain)

  • M. C. Asensio

    (LURE, Bât. 209d, Centre Universitaire Paris Sud, 91405, Orsay, France;
    Instituto de Ciencia de Materiales de Madrid, CSIC, Madrid, Spain)

Abstract

The role of Sb in the formation of the Co/GaAs(110) interfaces has been investigated by angular photoelectron diffraction (PD), synchrotron-radiation (SR) core-level photoemission and low-energy electron diffraction. We find that Co forms a metastable bcc phase on GaAs(110), with its principal crystallographic axes parallel to the substrate. From polar-angle-scanned PD, we determine an outward expansion of up to 14% of the lattice constant perpendicular to the surface, for epitaxial Co films grown on nontreated substrates. By Sb passivation of the GaAs(110) surface prior to the Co deposition, the epitaxial quality of the metallic overlayer is improved. The resulting Co phase is found to grow in a perfect bcc (110) orientation with a minor disruption of the substrate underneath and a reduced intralayer spacing outward expansion of less than 1%.

Suggested Citation

  • C. M. Teodorescu & J. Chrost & H. Ascolani & J. Avila & F. Soria & M. C. Asensio, 1998. "Growth of Epitaxial Co Layers on Sb-Passivated GaAs(110) Substrates," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 5(01), pages 279-283.
    • Handle: RePEc:wsi:srlxxx:v:05:y:1998:i:01:n:s0218625x98000517
    DOI: 10.1142/S0218625X98000517
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