  By an exact analytical approach we study the magnetothermal transport in the
spin-1/2 easy-axis Heisenberg model, in particular the thermal conductivity and
spin Seebeck effect as a function of anisotropy, magnetic field and
temperature. We stress a distinction between the commnon spin Seebeck effect
with fixed boundary conditions and the one (intrinsic) with open boundary
conditions. In the open boundary spin Seebeck effect we find exceptional
features at the critical fields between the low field antiferromagnetic phase,
the gapless one and the ferromagnetic at high fields. We further study the
development of these features as a function of easy-axis anisotropy and
temperature. We point out the potential of these results to experimental
studies in spin chain compounds, candidates for spin current generation in the
field of spintronics.
