  Neuromorphic computing systems may be the future of computing and
cluster-based networks are a promising architecture for the realization of
these systems. The creation and dissolution of synapses between the clusters
are of great importance for their function. In this work, we model the thermal
breakage of a gold nanofilament located between two gold nanoparticles via
molecular dynamics simulations to study on the mechanisms of neuromorphic
nanoparticle-based devices. We employ simulations of Au nanowires of different
lengths ($2-8$ nm), widths ($0.4-0.8$ nm) and shapes connecting two Au$_{1415}$
nanoparticles (NPs) and monitor the evolution of the system via a detailed
structural identification analysis. We found that atoms of the nanofilament
gradually aggregate towards the clusters, causing the middle of the wire to
gradually thin and then break. Most of the system remains crystalline during
this process but the center is molten. The terminal NPs increase the melting
point of the NWs by fixing the middle wire and act as recrystallization areas.
We report a strong dependence on the width of the NWs, but also their length
and structure. These results may serve as guidelines for the realization of
cluster-based neuromorphic computing systems.
