  The anomalous Nernst effect (ANE) is a thermomagnetic phenomenon with
potential applications in thermal energy harvesting. While many recent works
studied the approaches to increase the ANE coefficient of materials, relatively
little effort was devoted to increasing the power supplied by the effect. Here
we demonstrate a nanofabricated device with record power density generated by
the ANE. To accomplish this, we fabricate micrometer-sized devices in which the
thermal gradient is three orders of magnitude higher than conventional
macroscopic devices. In addition, we use Co/Pt multilayers, a system
characterized by a high ANE thermopower (~1 microV/K), low electrical
resistivity, and perpendicular magnetic anisotropy. These innovations allow us
to obtain power densities of around 13 W/cm3. We believe that this design may
find uses in harvesting wasted energy in e.g. electronic devices.
