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Thermopower Properties of Ferromagnetic/Insulator/Ferromagnetic Tunnel Junction

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Abstract

The thermal conductance, thermopower, and figure of merit in the ferromagnetic/insulator/ferromagnetic tunnel junction are investigated by using the nonequilibrium Green’s function technique. The magnetic regions are treated as band ferromagnetic and are described by using the single-band Hubbard model; the insulator region and the hybridization between neighboring regions are also described, respectively, by using a quantum microscopic model. It was found that the strength of the thermal conductance, the thermopower, and the figure of merit increased with the increase of the level of the left ferromagnet \(\varepsilon _{k_\mathrm{L}}\) and the temperature \(T.\) Finally, the calculated results of thermal properties are explained theoretically.

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Acknowledgments

This project is supported by the prime scientific research foundation of Changzhou University ZMF 1002133, ZMF09020023, and National Natural Science Foundation of China No. 51202195.

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Authors and Affiliations

  1. School of Mathematics and Physics, Changzhou University, Changzhou, 213164, People’s Republic of China

    Xian-Sheng Cao, Gao-Feng Ji & Feng Li

  2. Shaanxi Key Laboratory of Condensed Matter Structures and Properties, School of Science, Northwestern Polytechnical University, Xi’an, 710072, People’s Republic of China

    Bing-chen Luo

  3. Department of Microelectronics, State Key Laboratory of ASIC and Systems, Fudan University, Shanghai, 200433, People’s Republic of China

    Gao-Feng Ji

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  1. Xian-Sheng Cao
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  2. Gao-Feng Ji
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Correspondence to Xian-Sheng Cao.

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Cao, XS., Ji, GF., Luo, Bc. et al. Thermopower Properties of Ferromagnetic/Insulator/Ferromagnetic Tunnel Junction. Int J Thermophys 34, 1347–1352 (2013). https://doi.org/10.1007/s10765-013-1494-z

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  • DOI: https://doi.org/10.1007/s10765-013-1494-z

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