  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.
