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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.08327 |
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| _version_ | 1866915488412467200 |
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| author | Park, Sang J. Keisuke, Hirata Sepehri-Amin, Hossein Ando, Fuyuki Hirai, Takamasa Uchida, Ken-ichi |
| author_facet | Park, Sang J. Keisuke, Hirata Sepehri-Amin, Hossein Ando, Fuyuki Hirai, Takamasa Uchida, Ken-ichi |
| contents | The spin Seebeck effect (SSE) enables thermoelectric conversion through thermally generated spin currents in magnetic materials, offering a promising transverse geometry for scalable devices. However, conventional SSE devices are confined to nanoscale thin-film architectures, with significantly restricted output power due to the intrinsic constraints of spin and magnon diffusion lengths. Here, we demonstrate a trans-scale SSE using nano-structured bulk composite materials composed of Pt-coated yttrium iron garnet (YIG) powders fabricated via dynamic powder sputtering and low-temperature sintering. The resulting three-dimensional composites exhibit continuous Pt channels and robust mechanical integrity. The effective electrical conductivity of the composites is 2-3 orders of magnitude higher than conventional thin-film-based YIG/Pt devices. Transverse thermoelectric measurements confirm isotropic SSE signals at the bulk scale. This work establishes a scalable platform for bulk SSE-based thermoelectrics, bridging nanoscale spin caloritronics with macroscopic device integration. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_08327 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Trans-scale spin Seebeck effect in nanostructured bulk composites based on magnetic insulator Park, Sang J. Keisuke, Hirata Sepehri-Amin, Hossein Ando, Fuyuki Hirai, Takamasa Uchida, Ken-ichi Materials Science The spin Seebeck effect (SSE) enables thermoelectric conversion through thermally generated spin currents in magnetic materials, offering a promising transverse geometry for scalable devices. However, conventional SSE devices are confined to nanoscale thin-film architectures, with significantly restricted output power due to the intrinsic constraints of spin and magnon diffusion lengths. Here, we demonstrate a trans-scale SSE using nano-structured bulk composite materials composed of Pt-coated yttrium iron garnet (YIG) powders fabricated via dynamic powder sputtering and low-temperature sintering. The resulting three-dimensional composites exhibit continuous Pt channels and robust mechanical integrity. The effective electrical conductivity of the composites is 2-3 orders of magnitude higher than conventional thin-film-based YIG/Pt devices. Transverse thermoelectric measurements confirm isotropic SSE signals at the bulk scale. This work establishes a scalable platform for bulk SSE-based thermoelectrics, bridging nanoscale spin caloritronics with macroscopic device integration. |
| title | Trans-scale spin Seebeck effect in nanostructured bulk composites based on magnetic insulator |
| topic | Materials Science |
| url | https://arxiv.org/abs/2509.08327 |