Bipolarity of large anomalous Nernst effect in Weyl magnet-based alloy films

Noguchi, Shun; Fujiwara, Kohei; Yanagi, Yuki; Suzuki, Michi-To; Hirai, Takamasa; Seki, Takeshi; Uchida, Ken-ichi; Tsukazaki, Atsushi

doi:10.1038/s41567-023-02293-z

Nat. Phys.

2024

DOI: 10.1038/s41567-023-02293-z

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Bipolarity of large anomalous Nernst effect in Weyl magnet-based alloy films

Shun Noguchi,

Kohei Fujiwara,

Yuki Yanagi

et al.

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Cited by 6 publications

(1 citation statement)

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“…Unlike the ordinary Nernst effect [8], which requires a substantial magnetic field to obtain large transverse thermopower, the ANE offers the distinct advantage of generating transverse thermopower under a small magnetic field. It is noteworthy that for magnetic materials with spontaneous magnetization, including permanent magnets, transverse thermopower can be generated in the absence of an external magnetic field [9][10][11]. The ANE-driven electric field EANE is expressed as…”

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confidence: 99%

Quantitative measurement of figure of merit for transverse thermoelectric conversion in Fe/Pt metallic multilayers

Yamazaki,

Hirai,

Yagi

et al. 2024

Phys. Rev. Applied

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This study presents a measurement method for determining the figure of merit for transverse thermoelectric conversion (zTT) in thin film forms. Leveraging the proposed methodology, we comprehensively investigate the transverse thermoelectric coefficient (ST), in-plane electrical conductivity (σyy), and out-of-plane thermal conductivity (κxx) in epitaxial and polycrystalline Fe/Pt metallic multilayers. The κxx values of multilayers with a number of stacking repetitions (N) of 200 are lower than those of FePt alloy films, indicating that the multilayer structure effectively contributes to the suppression of κxx. zTT is found to increase with increasing N, which remarkably reflects the Ndependent enhancement of the ST values. Notably, ST and σyy are significantly larger in the epitaxial multilayers than those in the polycrystalline counterparts, whereas negligible differences in κxx are observed between the epitaxial and polycrystalline multilayers. This discrepancy in σyy and κxx with respect to crystal growth is due to the different degree of anisotropy in electron transport between epitaxial and polycrystalline multilayers, and epitaxial growth can lead to an enhancement of zTT in the multilayers. The present measurement technique reveals the transverse thermoelectric properties inherent to multilayers. I. INTRODUCTIONTransverse thermoelectric conversion refers to the generation of electric field by perpendicularly applying a temperature gradient [1,2]. In contrast to the longitudinal thermoelectric conversion based on the Seebeck effect (SE), which needs three-dimensional serial junctions to achieve high device performance, the transverse thermoelectric conversion has an advantage of a

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confidence: 99%

Quantitative measurement of figure of merit for transverse thermoelectric conversion in Fe/Pt metallic multilayers

Yamazaki,

Hirai,

Yagi

et al. 2024

Phys. Rev. Applied

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Bipolar transverse thermopower and low thermal conductivity for an anomalous Nernst-type heat flux sensor in GdCo alloys

Odagiri,

Imaeda,

Yagmur

et al. 2024

Sci Rep

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Significant improvement in sensitivity of an anomalous Nernst heat flux sensor by composite structure

Imaeda,

Toida,

Takeuchi

et al. 2024

Applied Physics Letters

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Heat flux sensors (HFS) have attracted significant interest for their potential in managing waste heat efficiently. A recently proposed HFS, which works on the basis of the anomalous Nernst effect (ANE), offers several advantages in its simple structure leading to easy fabrication, low cost, and reduced thermal resistance. However, enhancing sensitivity through traditional material selection is now challenging due to a small number of materials satisfying the required coexistence of a large transverse thermopower and low thermal conductivity. In this study, by utilizing composite structures and optimizing the device geometry, we have achieved a substantial improvement in the sensitivity of an ANE-based HFS. We developed composite structures comprised of a plastic substrate with an uneven surface and three-dimensional (3D) uneven TbCo films, fabricated using nanoimprint techniques and sputtering. This approach resulted in a sensitivity that is approximately four times greater than that observed in previous studies. Importantly, this method is independent of the material properties and can significantly enhance the sensitivity. Our findings could lead to the development of highly sensitive HFS devices and open avenues for the fabrication of 3D devices.

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Bipolarity of large anomalous Nernst effect in Weyl magnet-based alloy films

Cited by 6 publications

References 46 publications

Quantitative measurement of figure of merit for transverse thermoelectric conversion in Fe/Pt metallic multilayers

Quantitative measurement of figure of merit for transverse thermoelectric conversion in Fe/Pt metallic multilayers

Bipolar transverse thermopower and low thermal conductivity for an anomalous Nernst-type heat flux sensor in GdCo alloys

Significant improvement in sensitivity of an anomalous Nernst heat flux sensor by composite structure

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