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Strain Relief via Island Ramification in Submonolayer Hereroepitaxy

Author

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  • Bert Müller

    (Institut de Physique Expérimentale, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland;
    Institut für Quantenelektronik, Eidgenössische Technische Hochschule Zürich, CH-8093 Zürich, Switzerland)

  • Lorenz P. Nedelmann

    (Institut de Physique Expérimentale, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland)

  • Bjørn Fischer

    (Institut de Physique Expérimentale, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland)

  • Harald Brune

    (Institut de Physique Expérimentale, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland)

  • Johannes V. Barth

    (Institut de Physique Expérimentale, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland)

  • Klaus Kern

    (Institut de Physique Expérimentale, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland)

  • Daniel Erdös

    (Institut für Festkörperphysik, Universität Hannover, D-30167 Hannover, Germany)

  • Joachim Wollschläger

    (Institut für Festkörperphysik, Universität Hannover, D-30167 Hannover, Germany)

Abstract

The mechanisms of strain relief in sub monolayer heteroepitaxy of Cu/Ni(100) are studied using variable temperature scanning tunneling microscopy and high resolution low energy electron diffraction. It is demonstrated that pseudomorphic copper islands, as they grow in size, undergo a spontaneous shape transition. Below a critical island size of about 500 atoms the islands have a compact shape, while above this size they become ramified. The shape transition of the coherently strained islands, predicted theoretically by Tersoff and Tromp, is driven by the size-dependent outward relaxation of the step edge atoms due to the positive lattice mismatch. The ramified island shape, which reflects the energy minimum of binding and strain energy, is characterized by only one parameter: the arm width of the monolayer-high copper islandsw =22±1)atoms.

Suggested Citation

  • Bert Müller & Lorenz P. Nedelmann & Bjørn Fischer & Harald Brune & Johannes V. Barth & Klaus Kern & Daniel Erdös & Joachim Wollschläger, 1998. "Strain Relief via Island Ramification in Submonolayer Hereroepitaxy," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 5(03n04), pages 769-781.
    • Handle: RePEc:wsi:srlxxx:v:05:y:1998:i:03n04:n:s0218625x98001158
    DOI: 10.1142/S0218625X98001158
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