This brief is based on computations performed on unary neutral and charged iron clusters
binary iron clusters and iron clusters interacting with carbon and oxygen atoms as well as
with a number of diatomics and water. The author considers geometrical structure thermodynamic
stability and electronic properties which are compared with experimental data. Special
attention is paid to the dependence of total spin magnetic moments of iron clusters on their
size charge and interactions with dopant and absorbed atoms. In the dopant case species such
as 3d-metal 4d-metal Al and Gd atoms are considered. In the adsorption case interactions of
carbon atoms with iron clusters as the initial stage of catalyzed carbon nanotube growth are
presented. Interactions of iron clusters with oxygen atoms are presented and the superexchange
mechanism is discussed. Of special interest is the tracking of changes due to the evolution
from a few atoms to a nanocluster.
