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Anomalous Hall and anomalous Nernst properties of thin MgO/Co2Fe0.4Mn0.6Si/Pd stacks with perpendicular magnetic anisotropy (PMA) revealed the presence of the magnetic proximity effect (MPE) in the Pd layer. The MPE is evidenced by nanometer range thickness-dependent transport measurements. A three-layer model that combines bulk and interface contributions accounts for our experimental data and provides quantitative estimates for the contributions to the total anomalous Nernst voltage of the ferromagnet Heusler [+0.97 μV/(K nm)] and the proximity-magnetized Pd layers [−0.17 μV/(K nm)]. The anomalous Nernst effect (ANE) reverses its sign by tuning the thickness of the Heusler layer, which is useful for designing ANE thermopiles.

Thermoelectric phenomena can be strongly modified in nanostructures. The determination of the Seebeck coefficient (S) in nanomaterials is a challenge since the mechanisms are different from the bulk. Here, we demonstrate a strong variation in S induced by electron–phonon interactions. Microscopic mechanisms are identified by using thermoelectric voltage dependencies as fingerprints. We found that different mechanisms can dominate, depending on the hybrid system. Our improved understanding will contribute to the future control of thermoelectric effects on nanoelectronic devices.