Abstract
The spin Seebeck effect, a newly discovered phenomena, has been suggested as a potential ‘game changer’ for thermoelectric technology due to the possibility of separating the electric and thermal conductivities. This is due to a completely different device architecture where, instead of an arrangement of p‐ and n‐type pillars between two ceramic blocks, a thermopile could be deposited directly onto a magnetic film of interest. Here we report on the spin Seebeck effect in polycrystalline Fe3O4:Pt bilayers deposited onto amorphous glass substrates with a view for economically viable energy harvesting. Crucially, these films exhibit large coercive fields (197 Oe) and retain 75% of saturation magnetisation, in conjunction with energy conversion comparable to epitaxially grown films. This demonstrates the potential of this technology for widespread application in harvesting waste heat for electricity.
Highlights
A new direction in thermoelectric research has recently emerged where it could be possible to separate the electric and thermal conductivities in a device: the parameters typically limiting conventional thermoelectric generators [1]
The grain boundaries of columnar Fe3O4 seen in the scanning TEM bright field (STEM/BF) image (Fig. 2(a)) that are not visible in the STEM/high angle annular dark-field (HAADF) image of (Fig. 2(b)), indicates that the Fe3O4 grains are all the same phase
4 Conclusion To conclude, we have demonstrated comparable energy conversion in polycrystalline Fe3O4 films deposited onto glass with respect to epitaxial films
Summary
A new direction in thermoelectric research has recently emerged where it could be possible to separate the electric and thermal conductivities in a device: the parameters typically limiting conventional thermoelectric generators [1]. Caruana et al.: Polycrystalline thin film coatings on glass for spin Seebeck energy harvesting the transverse SSE, where a thermal gradient is applied parallel to the M:PM interface (Fig. 1(b)).
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