A mono-material Nernst thermopile with hermaphroditic legs

Abstract

A large transverse thermoelectric response, known as anomalous Nernst effect (ANE) has been recently observed in several topological magnets. Building a thermopile employing this effect has been the subject of several recent propositions. Here, we design and build a thermopile with an array of tilted adjacent crystals of Mn${}_3$Sn. The design employs a single material and replaces pairs of P and N thermocouples of the traditional design with hermaphroditic legs. The design exploits the large lag angle between the applied field and the magnetization, which we attribute to the interruption of magnetic octupoles at the edge of $xy$-plane. Eliminating extrinsic contacts between legs will boost the efficiency, simplify the process and pave the way for a new generation of thermopiles.

arXiv comment10 pages, 4 figures. Accepted by Advanced Materials

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Cited by in corpus (4)

• Topological charge-entropy scaling in kagome Chern magnet TbMn${}_6$Sn${}_6$
• Field-linear anomalous Hall effect and Berry curvature induced by spin chirality in the kagome antiferromagnet Mn3Sn
• Magnetostriction, piezomagnetism and domain nucleation in a kagome antiferromagnet
• The free energy of twisting spins in Mn${}_3$Sn