INVESTIGADORES
VIDAL ricardo Alberto
artículos
Título:
STM study of the initial stages of AlF3 on Cu(100)
Autor/es:
J. C. MORENO-LÓPEZ; R. A. VIDAL; M. C. G. PASSEGGI, JR.; J. FERRÓN
Revista:
PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS
Editorial:
American Physical Society
Referencias:
Año: 2010 vol. 81 p. 754201 - 754207
ISSN:
0163-1829
Resumen:
In this study we present results concerning the early growth stages of an insulator-metal interface by means of scanning tunnelling microscopy. We report the growth of aluminium fluoride (AlF3) films over a Cu(100) surface at room temperature, from sub-monolayer coverages up to 1.25 monolayers. Scanning tunnelling microscopy measurements reveal that aluminium fluoride islands undergo a shape transition at very low coverages, from compact to fractal-like, as they grow in size. These fractal-like islands cover the substrate with a single monolayer film up to depositions of 0.80 monolayers, while for larger coverages the growth results in the formation of three dimension islands. Kinetic Monte Carlo simulations help us to understand some issues of the growth mechanism. High voltages (V > 2.50 V) are needed to obtain STM images, showing the insulator character of the AlF3 islands.