Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)
O 36.47: Poster
Dienstag, 15. März 2011, 18:30–22:00, P4
Role of closed compact island during submonolayer pulsed deposition — Martin Mašín and •Miroslav Kotrla — Institute of Physics, ASCR, Na Slovance 2, Prague, Czech Republic
We study temperature dependence of island densities during Pulsed Laser Deposition (PLD) in submonolayer regime. We employ full diffusion kinetic Monte Carlo simulation. Attachment of monomers to islands is irreversible at low temperatures while it becomes reversible at higher temperatures. Our model allows us to study processes on different time scales with parameters for typical PLD experiments: fast deposition (on scale order of 10−5 s), and relaxation between pulses (on scale of order of 0.1 s).
In this contribution, we further explore recently observed anomalous behavior of temperature dependence of island density [EPL 90 (2010) 18006] which is due to interplay between the cluster decay time and the interval between pulses. The anomalous behavior is caused by the temperature limited stability of closed–compact clusters. We investigate temperature dependent distribution of the closed–compact island for different material and deposition parameters. In particular, we study the dependence on range and strength of the binding interaction (we include interactions to second and third neighbors) and on frequency of pulses. We compare island density of small islands for two modes: PLD and continuous Molecular Beam Epitaxy (MBE) growth. Furthermore, by varying interactions energies, diffusion barrier and parameters of deposition, we compare results of simulations with the PLD experiment for Fe/Mo system.