Conventional thermoelectric technologies lose efficiency at the nanometre scale, posing a major challenge for cooling miniaturised electronic chips.
To address this, Pascal Gehring’s team (WEL Research Institute – UCLouvain) harnessed the topological properties of the magnetic Weyl semimetal Co₂MnGa. By structuring the material at micro- and nanometre scales, they observed an unusually high Ettingshausen effect at room temperature, further enhanced by a longitudinal Peltier effect induced by nanoribbons. These findings highlight the potential of magnetic Weyl semimetals as hybrid thermoelectric systems, capable of combining efficient cooling with the direct utilisation of their topological properties at the nanoscale.
Reference: Razeghi et al., Giant Anomalous Ettingshausen Effect and Hybrid Longitudinal–Transverse Thermoelectric Cooling in a Nanoscale Magnetic Weyl Semimetal, ACS Nano (2025) 19: 39725–39734
