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We provide a thermodynamically consistent description of energy, charge andspin transfers in a thermoelectric quantum-dot spin valve in the collinearconfiguration based on nonequilibrium Green's function and full countingstatistics. We use the fluctuation theorem symmetry and the concept of entropyproduction to characterize the efficiency with which thermal gradients cantransduce charges or spins against their chemical potentials, arbitrary farfrom equilibrium. Close to equilibrium, we recover the Onsager reciprocalrelations and the connection to linear response notions of performance such asthe figure of merit. We also identify regimes where work extraction is moreefficient far then close from equilibrium.

Thermodynamics of energy, charge and spin currents in thermoelectric quantum-dot spin valve