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The usually negligibly small thermoelectric effects in superconductingheterostructures can be boosted dramatically due to the simultaneous effect ofspin splitting and spin filtering. Building on an idea of our earlier work[Phys. Rev. Lett. $\textbf{110}$, 047002 (2013)], we propose realisticmesoscopic setups to observe thermoelectric effects in superconductorheterostructures with ferromagnetic interfaces or terminals. We focus on theSeebeck effect being a direct measure of the local thermoelectric response andfind that a thermopower of the order of $\sim200$ $\mu V/K$ can be achieved ina transistor-like structure, in which a third terminal allows to drain thethermal current. A measurement of the thermopower can furthermore be used todetermine quantitatively the spin-dependent interface parameters that inducethe spin splitting. For applications in nanoscale cooling we discuss the figureof merit for which we find enormous values exceeding 1 for temperature$\lesssim 1$K.

Giant thermoelectric effects in a proximity-coupled superconductor-ferromagnet device