  We introduce a new sample of galaxy clusters obtained from a cosmological
simulation covering an unprecedented dynamical range. All the clusters in our
sample show a clear signature of small-scale dynamo amplification. We show that
it is possible to use dynamo theory for studying the magnetic spectrum in the
intracluster medium. We study if the intrinsic variations on the spectra depend
on the dynamical history of each cluster or on some host cluster properties.
