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説明:

In artificially tilted multilayers comprising two different conductors that are alternately and obliquely stacked, transverse thermoelectric conversion occurs, in which charge and heat currents are interconverted in the orthogonal direction. Although transverse thermoelectric conversion also occurs in homogeneous materials as an intrinsic transport phenomenon owing to the effects of magnetic fields, magnetization, and spins on conduction carriers, such magneto-thermoelectric effects are investigated independently of thermoelectrics for artificially tilted multilayers. Here, this study shows that the synergy of these different principles improves the performance of transverse thermoelectric conversion. Using lock-in thermography techniques, transverse thermoelectric conversion processes are visualized in artificially tilted multilayers and the experiments clarify how nonuniform charge currents are converted into orthogonal heat currents. Through the measurements of temperature change under magnetic fields, the contributions of the magneto-thermoelectric effects are quantified in the artificially tilted multilayers and magnetically enhanced hybrid transverse thermoelectric cooling is demonstrated. By replacing one of the conductors in the multilayer with permanent magnets, the same functionality is obtained even in the absence of magnetic fields, paving the way for the creation of “thermoelectric permanent magnets” that exhibit efficient transverse thermoelectric conversion together with spontaneous magnetization. This study provides a new material design guideline for transverse thermoelectrics.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: transverse thermoelectrics, artificially tilted multilayers, magneto-Peltier effect, Ettingshausen effect, permanent magnets, lock-in thermography

刊行年月日: 2023-11-29

出版者: Wiley

掲載誌:

• Advanced Energy Materials (ISSN: 16146832) vol. 14 issue. 3 p. 2302375-2302375

研究助成金:

• JST JPMJER2201 (ERATO内田磁性熱動体プロジェクト)

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1002/aenm.202302375

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更新時刻: 2024-01-22 16:32:56 +0900

MDRでの公開時刻: 2024-01-23 12:30:14 +0900