  In the past, magnons have been shown to mediate thermal transport of spin in
various systems. Here, we reveal that the fundamental coupling of scalar spin
chirality, inherent to magnons, to the electronic degrees of freedom in the
system can result in the generation of sizeable orbital magnetization and
thermal transport of orbital angular momentum. We demonstrate the emergence of
the latter phenomenon of orbital Nernst effect by referring to the spin-wave
Hamiltonian of kagome ferromagnets, predicting that in a wide range of systems
the transverse current of orbital angular momentum carried by magnons in
response to an applied temperature gradient can overshadow the accompanying
spin current. We suggest that the discovered effect fundamentally correlates
with the topological Hall effect of fluctuating magnets, and it can be utilized
in magnonic devices for generating magnonic orbital torques.
