Large Anomalous Nernst Effect in a van der Waals Ferromagnet Fe3GeTe2

Anomalous Nernst effect (ANE), a result of charge current driven by temperature gradient, provides a probe of the topological nature of materials due to its sensitivity to the Berry curvature near the Fermi level.  Of  particular  interest  is  the  ANE  in  topological  materials because the special band topology in these materials could introduce a very large ANE.


Fe3GeTe2 (FGT), one important member of the recently discovered two-dimensional van der Waals magnetic materials, offers a unique platform for ANE because of its metallic and topological nature. Here, we report the observation of large  anomalous  Nernst effect  in  FGT caused  by  a  large  Berry  curvature  near  the  Fermi  level.  Our  work provides  evidence  of  FGT  as  a  topological  ferromagnet  and demonstrates  the  feasibility  of  using  two-dimensional  magnetic materials and their band topology for spin caloritronics applications.

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