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Transverse thermoelectric generation converts temperature gradient in one direction into electric field perpendicular to that direction, and is expected to be a promising alternative in creating simple-structured thermoelectric modules that can avoid the challenging problems facing traditional Seebeck-effect-based modules. Recently, large transverse thermopower is observed in closed circuits consisting of magnetic and thermoelectric materials, which is referred to as the Seebeck-driven transverse magneto-thermoelectric generation (STTG). However, the closed-circuit structure complicates its broad applications. Here, we realize STTG in the simplest way to combine magnetic and thermoelectric materials, namely, by stacking a magnetic layer and a thermoelectric layer together to form a bilayer. We derive the expression for its transverse thermopower, which varies with changing layer thicknesses and peaks at a much larger value under an optimal thickness ratio. This behavior is verified in experiment, through a serial of samples prepared by depositing Fe-Ga alloy thin films of various thicknesses onto n-type Si substrates. The measured transverse thermopower reaches 15.2±0.4 μV K−1, which is a fivefold increase from that of Fe-Ga alloy and much larger than the current room temperature record observed in Weyl semimetal Co2MnGa. Our findings highlight the potential in combining magnetic and thermoelectric materials for transverse thermoelectric applications.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: anomalous Hall effect, anomalous Nernst effect, Seebeck effect, spin caloritronics, transverse thermoelectric generation

刊行年月日: 2024-03-06

出版者: Wiley

掲載誌:

• Advanced Science (ISSN: 21983844) vol. 11 issue. 18 2308543

研究助成金:

• Japan Society for the Promotion of Science JP22K20494
• Exploratory Research for Advanced Technology JPMJER2201

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1002/advs.202308543

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更新時刻: 2024-08-31 08:30:12 +0900

MDRでの公開時刻: 2024-08-31 08:30:12 +0900