  Conventional and spin-related thermoelectric effects in electronic transport
through a nanoscopic system exhibiting magnetic anisotropy $-$with both
uniaxial and transverse components$-$ are studied theoretically in the linear
response regime. In particular, a magnetic tunnel junction with a large-spin
impurity $-$either a magnetic atom or a magnetic molecule$-$ embedded in the
barrier is considered as an example. Owing to magnetic interaction with the
impurity, conduction electrons traversing the junction can scatter on the
impurity, which effectively can lead to angular momentum and energy exchange
between the electrons and the impurity. As we show, such processes have a
profound effect on the thermoelectric response of the system. Specifically, we
present a detailed analysis of charge, spin and thermal conductance, together
with the Seebeck and spin Seebeck coefficients (thermopowers). Since the
scattering mechanism also involves processes when electrons are inelastically
scattered back to the same electrode, one can expect the flow of spin and
energy also in the absence of charge transport through the junction. This, in
turn, results in a finite spin thermopower, and the magnetic anisotropy plays a
key role for this effect to occur.
