Cluster growth processes by direct simulation monte carlo method |
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Authors: | H Mizuseki Y Jin Y Kawazoe LT Wille |
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Institution: | (1) Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan, JP;(2) Department of Physics, Florida Atlantic University, Boca Raton, FL 33431, USA, US |
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Abstract: | Thin films obtained by cluster deposition have attracted strong attention both as a new manufacturing technique to realize
high-density magnetic recording media and to create systems with unique magnetic properties. Because the film’s features are
influenced by the cluster properties during the flight path, the relevant physical scale to be studied is as large as centimeters.
In this paper, a new model of cluster growth processes based on a combination of the Direct Simulation Monte Carlo (DSMC)
method and the cluster growth model is introduced to examine the effects of experimental conditions on cluster growth by an
adiabatic expansion process. From the macroscopic viewpoint, we simulate the behavior of clusters and inert gas in the flight
path under different experimental conditions. The internal energy of the cluster, which consists of rotational and vibrational
energies, is limited by the binding energy which depends on the cluster size. These internal and binding energies are used
as criteria of the cluster growth. The binding energy is estimated by surface and volume terms. Several types of size distribution
of generated clusters under various conditions are obtained by the present model. The results of the present numerical simulations
reveal that the size distribution is strongly related to the experimental conditions and can be controlled.
Received: 23 January 2001 / Accepted: 3 May 2001 / Published online: 30 August 2001 |
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Keywords: | PACS: 47 45 -n 61 46 +w 81 10 Bk 81 15 Aa |
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