Simultaneous achievement of large anomalous Nernst effect and reduced thermal conductivity in sintered polycrystalline topological Heusler ferromagnets
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| Auteurs principaux: | , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916810370056192 |
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| author | Oyanagi, Koichi Sepehri-Amin, Hossein Takamori, Kenta Tadano, Terumasa Imamura, Takumi Nagasawa, Ren Mahalingam, Krishnan Hirai, Takamasa Ando, Fuyuki Sakuraba, Yuya Kobayashi, Satoru Uchida, Ken-ichi |
| author_facet | Oyanagi, Koichi Sepehri-Amin, Hossein Takamori, Kenta Tadano, Terumasa Imamura, Takumi Nagasawa, Ren Mahalingam, Krishnan Hirai, Takamasa Ando, Fuyuki Sakuraba, Yuya Kobayashi, Satoru Uchida, Ken-ichi |
| contents | This study reports the observation of the large anomalous Nernst effect in polycrystalline ferromagnetic Co$_{2}$MnGa (CMG) slabs prepared by a spark plasma sintering method. By optimizing the sintering conditions, the anomalous Nernst coefficient reaches ~7.5 $μ$V K$^{-1}$ at room temperature, comparable to the highest value reported in the single-crystalline CMG slabs. Owing to the sizable anomalous Nernst coefficient and reduced thermal conductivity, the dimensionless figure of merit in our optimized CMG slab shows the record-high value of ~8$\times$10$^{-4}$ at room temperature. With the aid of the nano/microstructure characterization and first-principles phonon calculation, this study discusses the dependence of the transport properties on the degree of crystalline ordering and morphology of crystal-domain boundaries in the sintered CMG slabs. The results reveal a potential of polycrystalline topological materials for transverse thermoelectric applications, enabling the construction of large-scale modules. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_09965 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Simultaneous achievement of large anomalous Nernst effect and reduced thermal conductivity in sintered polycrystalline topological Heusler ferromagnets Oyanagi, Koichi Sepehri-Amin, Hossein Takamori, Kenta Tadano, Terumasa Imamura, Takumi Nagasawa, Ren Mahalingam, Krishnan Hirai, Takamasa Ando, Fuyuki Sakuraba, Yuya Kobayashi, Satoru Uchida, Ken-ichi Materials Science Applied Physics This study reports the observation of the large anomalous Nernst effect in polycrystalline ferromagnetic Co$_{2}$MnGa (CMG) slabs prepared by a spark plasma sintering method. By optimizing the sintering conditions, the anomalous Nernst coefficient reaches ~7.5 $μ$V K$^{-1}$ at room temperature, comparable to the highest value reported in the single-crystalline CMG slabs. Owing to the sizable anomalous Nernst coefficient and reduced thermal conductivity, the dimensionless figure of merit in our optimized CMG slab shows the record-high value of ~8$\times$10$^{-4}$ at room temperature. With the aid of the nano/microstructure characterization and first-principles phonon calculation, this study discusses the dependence of the transport properties on the degree of crystalline ordering and morphology of crystal-domain boundaries in the sintered CMG slabs. The results reveal a potential of polycrystalline topological materials for transverse thermoelectric applications, enabling the construction of large-scale modules. |
| title | Simultaneous achievement of large anomalous Nernst effect and reduced thermal conductivity in sintered polycrystalline topological Heusler ferromagnets |
| topic | Materials Science Applied Physics |
| url | https://arxiv.org/abs/2501.09965 |