Transverse magneto-thermoelectric properties of Fe2CoSi alloy and Fe2CoSi–Pt composite films

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Abstract
We report a systematic evaluation of the effects of post-deposition annealing temperature and structural ordering on the anomalous Nernst effect (ANE) in Fe2CoSi (FCS) Heusler alloy thin films. The study reveals that amorphous/disordered FCS films exhibit a larger anomalous Nernst coefficient (SANE) compared to their crystalline counterparts, in stark contrast to conventional Co-based Heusler alloys, which typically show maximum SANE in highly ordered structures. Furthermore, as a strategy for enhancing transverse thermoelectric properties, we explore the (FCS)100−xPtx composite alloy films by systematically varying the Pt concentration and optimizing the composition. This method effectively enhances the transverse thermoelectric performance of the FCS-based alloys. Our findings offer valuable insights into the design and development of next-generation high-performance ANE materials.
Funding Information
  • Exploratory Research for Advanced Technology (JPMJER2201)
  • Japan Society for the Promotion of Science (22H04965)
  • Japan Society for the Promotion of Science (P21064)
  • NEC Corporation

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