DENDRITIC ISLANDS IN METAL-ON-METAL EPITAXY .2. COALESCENCE AND MULTILAYER GROWTH

Citation
Mc. Bartelt et Jw. Evans, DENDRITIC ISLANDS IN METAL-ON-METAL EPITAXY .2. COALESCENCE AND MULTILAYER GROWTH, Surface science, 314(1), 1994, pp. 120000835-120000842
Citations number
41
Categorie Soggetti
Chemistry Physical
Journal title
ISSN journal
00396028
Volume
314
Issue
1
Year of publication
1994
Pages
120000835 - 120000842
Database
ISI
SICI code
0039-6028(1994)314:1<120000835:DIIME.>2.0.ZU;2-V
Abstract
Dendritic or fractal islands occur naturally during epitaxial growth i n systems where island edge diffusion is restricted. Here we use a lat tice-gas model to characterize the evolution of island structure in su ch systems, from the low coverage to the coalescence regime, and to co nsider the ramifications for multilayer growth. Island densification a nd slowing of radial growth prior to coalescence is observed in the si mulations, as in Au/Ru(0001). We also elucidate the relationship of th e real-space island structure to the width and shape of the correspond ing kinematic diffraction profile. Our multilayer growth studies incor porate disruption of and downward funneling from island edges upon imp act of depositing atoms, in the presence of a large Schwoebel barrier. Using the geometry and length scales appropriate for Pt/Pt(111), the calculated kinematic Bragg intensities for a two-layer model show that even limited disruption can produce the observed low-temperature ''re entrant'' oscillations.