  We combine the anisotropy of magnetic interactions and the point symmetry of
finite solids in the study of dipolar clusters as new basic units for
multiferroics metamaterials. The hamiltonian of magnetic dipoles with an easy
axis at the vertices of polygons and polyhedra, maps exactly into a hamiltonian
with symmetric and antisymmetric exchange couplings. The last one gives rise to
a Dzyaloshinskii-Moriya contribution responsible for the magnetic modes of the
systems and their symmetry groups, which coincide with those of a particle in a
crystal field with spin-orbit interaction. We find that the clusters carry spin
current and that they manifest the magnetoelectric effect. We expect our
results to pave the way for the rational design of magnetoelectric devices at
room temperature.
