Phenomenological analysis of transverse thermoelectric generation and cooling performance in magnetic/thermoelectric hybrid systems
Phenomenological analysis of transverse thermoelectric generation and cooling performance in magnetic/thermoelectric hybrid systems
复制标题
磁/热电混合系统横向热电发电和冷却性能的唯象分析
DOI：
10.1063/5.0055475
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发表时间：
2021
影响因子：
3.2
通讯作者：
K. Uchida
中科院分区：
文献类型：
--
作者：
Kaoru Yamamoto;R. Iguchi;A. Miura;Weinan Zhou;Y. Sakuraba;Y. Miura;K. Uchida
我们现象学地计算了最近观察到的Seebeck驱动的横向热电(STTG)在不同系统中的热电势、功率因数和品质因数，以证明STTG的有效性。STTG系统由一个由热电材料和磁性材料组成的闭合回路组成，分别表现出塞贝克效应和反常霍尔效应。当温度梯度施加到混合系统时，热电材料层中的塞贝克效应在闭合回路中产生纵向电荷电流，该电荷电流随后驱动磁性材料层中的反常霍尔效应。由Seebeck效应驱动的反常霍尔电压与基于反常能斯特效应的横向热电转换具有相似的对称性。我们发现，通过分别增大热电材料和磁性材料的塞贝克系数和反常霍尔角，以及优化它们的尺寸，STTG的热电性能可以比反常能斯特效应好得多。我们还推导了STTG系统的电子制冷性能，证实了混合横向热电转换的倒易关系。
We phenomenologically calculate the performance of the recently-observed Seebeck-driven transverse thermoelectric generation (STTG) for various systems in terms of the thermopower, power factor, and figure of merit to demonstrate the usefulness of STTG. The STTG system consists of a closed circuit comprising thermoelectric and magnetic materials which exhibit the Seebeck and anomalous Hall effects, respectively. When a temperature gradient is applied to the hybrid system, the Seebeck effect in the thermoelectric material layer generates a longitudinal charge current in the closed circuit and the charge current subsequently drives the anomalous Hall effect in the magnetic material layer. The anomalous Hall voltage driven by the Seebeck effect has a similar symmetry to the transverse thermoelectric conversion based on the anomalous Nernst effect. We find that the thermoelectric properties of STTG can be much better than those of the anomalous Nernst effect by increasing the Seebeck coefficient and anomalous Hall angle of the thermoelectric and magnetic materials, respectively, as well as by optimizing their dimensions. We also formulate the electronic cooling performance in the STTG system, confirming the reciprocal relation for the hybrid transverse thermoelectric conversion.