  We consider grains with superparamagnetic inclusions and report two new
condensed matter effects that can enhance the internal relaxation of the energy
of a wobbling grain, namely, superparamagnetic Barnett relaxation, as well as,
an increase of frequencies for which nuclear relaxation becomes important. This
findings extends the range of grain sizes for which grains are thermally
trapped, i.e. rotate thermally, in spite of the presence of uncompensated
pinwheel torques. In addition, we show that the alignment of dust grains by
radiative torques gets modified for superparamagnetic grains, with grains
obtaining perfect alignment with respect to magnetic fields as soon as the
grain gaseous randomization time gets larger than that of paramagnetic
relaxation. The same conclusion is valid for the mechanical alignment of
helical grains. If observations confirm that the degrees of alignment are
higher than radiative torques can produce alone, this may be a proof of the
presence of superparamagentic inclusions.
