  Topological insulators interacting with magnetic impurities have been
reported to host several unconventional effects. These phenomena are described
within the framework of gapping Dirac quasiparticles due to broken
time-reversal symmetry. However, the overwhelming majority of studies
demonstrate the presence of a finite density of states near the Dirac point
even once Topological insulators become magnetic. Here, we map the response of
topological states to magnetic impurities at the atomic scale. We demonstrate
that magnetic order and gapless states can coexist. We show how this is the
result of the delicate balance between two opposite trends, i.e. gap opening
and emergence of a Dirac node impurity band, both induced by the magnetic
dopants. Our results evidence a more intricate and rich scenario with respect
to the once generally assumed, showing how different electronic and magnetic
states may be generated and controlled in this fascinating class of materials.
