Modeling of early stages of island growth during pulsed deposition: Role of closed compact islands

Journal Article · Thu Mar 24 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3577673· OSTI ID:21511491

Kotrla, M; Masin, M ^[1]

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1. Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21, Praha 8 (Czech Republic)

After a brief review of recent modeling of growth during Pulsed Laser Deposition (PLD), we present the study of a role of adatom interactions on growth of surface islands during PLD in submonolayer regime. We employ kinetic Monte Carlo simulation with reversible growth. Attachment of monomers to islands is irreversible at low temperatures while it becomes reversible at higher temperatures, small islands become unstable with growing temperature. In the case of real system we have to take into account not only diffusion of monomers but also diffusivity of dimers and larger clusters and theirs stability. Our new code allows us to study processes which proceed on different time scales which are typical in PLD experiments: fast deposition (on scale order of 10{sup -5} s) during individual pulses, and relaxation of a system between pulses (on scale order of 0.1 s). We calculate and compare the temperature dependence of island density for two modes pulsed deposition and continuous Molecular Beam Epitaxy (MBE) growth. The island densities in PLD mode are substantially higher than in MBE mode, provided the temperature is sufficiently high. In the case of PLD, we observe anomalous temperature dependence of the island density in a certain temperature interval. It is due to the interplay between a cluster decay time and an interval between pulses. The cluster decay time depends not only on temperature but also on clusters size and shape. The anomalous behavior is caused by the temperature limited stability of the closed--compact clusters. This scenario was revealed for the simplified model with only nearest-neighbor interaction. Now, it is elucidated further and we also include interaction to second and third neighbors. We analyze role of the closed-compact surface island in kinetics of both growth modes. Furthermore, by varying interactions energies, diffusion barrier and parameters of deposition, we compare results of simulations with the PLD experiment for Fe/Mo system.

• OSTI ID: 21511491
• Journal Information: AIP Conference Proceedings, Vol. 1332, Issue 1; Conference: 11. Granada seminar on computational and statistical physics, La Herradura (Spain), 13-17 Sep 2010; Other Information: DOI: 10.1063/1.3577673; (c) 2011 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
DENSITY
DIFFUSION
DIFFUSION BARRIERS
DIMERS
ENERGY BEAM DEPOSITION
INTERACTIONS
LASER RADIATION
MOLECULAR BEAM EPITAXY
MONOMERS
MONTE CARLO METHOD
PULSED IRRADIATION
PULSES
RELAXATION
STABILITY
SURFACES
TEMPERATURE DEPENDENCE
CALCULATION METHODS
CRYSTAL GROWTH METHODS
DEPOSITION
ELECTROMAGNETIC RADIATION
EPITAXY
EVALUATION
IRRADIATION
PHYSICAL PROPERTIES
RADIATIONS
SIMULATION
SURFACE COATING