### Off-lattice Kinetic Monte Carlo simulations of strained hetero-epitaxial growth

**
Michael Biehl, Rijksuniversiteit Groningen
**

An off-lattice Kinetic Monte Carlo (KCM) method will be introduced,
which can be applied in the context of strained
heteroepitaxial crystal growth. Earlier applications of the method
will be summarized briefly. They concern the formation of misfit
dislocations at a critical film thickness and the emergence of
self-organized islands or *dots* in the so-called
Stranski-Krastanov growth mode.

Most recent studies were motivated by the experimental investigation
of ternary material sytems, e.g. CoAg/Ru(0001) and FeAg/Mo(110).
In such an AB/S system, the co-deposition of adsorbate materials A and B
on an appropriate substrate S can lead to a highly non-trivial composition
profile in the first monolayer already. If the lattice misfits of A and B
with respect to S differ in sign, one observes a variety of remarkable
structures. A particularly interesting example is the dendritic growth
of A/B islands with a stripe substructure on the nanometer scale.
Such structures might be of interest for the development of, for example,
novel magnetic storage devices.

Our KMC simulations show that both, the misfit induced strain and
kinetic seggregation effects, must be taken into account explicitly
for an explanation of experimental observations.