  A molecular dynamics simulation of the demixing process of a binary complex
plasma is analysed and the role of distinct interaction potentials is discussed
by using morphological Minkowski tensor analysis of the minority phase domain
growth in a demixing simulated binary complex plasma. These Minkowski tensor
methods are compared with previous results that utilized a power spectrum
method based on the time-dependent average structure factor. It is shown that
the Minkowski tensor methods are superior to the previously used power spectrum
method in the sense of higher sensitivity to changes in domain size. By
analysis of the slope of the temporal evolution of Minkowski tensor measures
qualitative differences between the case of particle interaction with a single
length scale compared to particle interactions with two different length scales
(dominating long range interaction) are revealed. After proper scaling the
graphs for the two length scale scenario coincide, pointing towards universal
behaviour. The qualitative difference in demixing scenarios is evidenced by
distinct demixing behaviour: In the long range dominated cases demixing occurs
in two stages. At first neighbouring particles agglomerate then domains start
to merge in cascades. However in the case of only one interaction length scale
only agglomeration but no merging of domains can be observed. Thus, Minkowski
Tensor analysis are likely to become a useful tool for further investigation of
this (and other) demixing processes. It is capable to reveal (nonlinear) local
topological properties, probing deeper than (linear) global power spectrum
analysis, however still providing easily interpretable results founded on a
solid mathematical framework.
