  Spin thermo-electric phenomena have attracted wide attention recently, e.g.
the Spin Peltier effect (SPE) heat generation by magnonic spin currents. Here
we find that the Spin Peltier ef-fect also manifests as a heat wave
accompanying fast moving magnetic textures. High speed andextreme magnetic
excitation localisation are paramount for efficient transfer of energy from
thespin-degrees of freedom to electrons and lattice. While satisfying both
conditions is subject to se-vere restrictions in ferromagnets, we find that
domain walls in antiferomagnets can overcome theselimitations due to their
potential ultrahigh mobility and ultra-small widths originating from the
rel-ativistic contraction. To illustrate our findings, we show that electric
current driven domain wallmotion in the antiferromagnetic metal Mn2Au can carry
a localised heat wave with the maximumamplitude up to 1 K . Since domain walls
are well localised nanoscale magnetic objects, this effecthas the potential for
nanoscale heating sensing and functionalities.
