Nonlinear Seebeck effect in Ni$_{81}$Fe$_{19}$|Pt at room temperature
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866913926640304128 |
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| author | Hirata, Y. Kikkawa, T. Arisawa, H. Saitoh, E. |
| author_facet | Hirata, Y. Kikkawa, T. Arisawa, H. Saitoh, E. |
| contents | The nonlinear Seebeck effect, nonlinear conversion of a temperature gradient into an electric current, was observed at room temperature. Based on a second-harmonic lock-in method combined with an a.c. temperature gradient, $\nabla T$, we measured a nonlinear Seebeck voltage in NiFe|Pt bilayers at 300 K, the amplitude of which increases in proportion to $(\nabla T)^2$. We also observed that the nonlinear Seebeck voltage increases as the sample length along the $\nabla T$ direction decreases, showing a characteristic scaling law distinct from the conventional linear Seebeck effect. We developed a phenomenological model for the nonlinear Seebeck effect incorporating the spin-current induced modulation of the Seebeck coefficient, which well reproduces the experimental results. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_03249 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Nonlinear Seebeck effect in Ni$_{81}$Fe$_{19}$|Pt at room temperature Hirata, Y. Kikkawa, T. Arisawa, H. Saitoh, E. Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science The nonlinear Seebeck effect, nonlinear conversion of a temperature gradient into an electric current, was observed at room temperature. Based on a second-harmonic lock-in method combined with an a.c. temperature gradient, $\nabla T$, we measured a nonlinear Seebeck voltage in NiFe|Pt bilayers at 300 K, the amplitude of which increases in proportion to $(\nabla T)^2$. We also observed that the nonlinear Seebeck voltage increases as the sample length along the $\nabla T$ direction decreases, showing a characteristic scaling law distinct from the conventional linear Seebeck effect. We developed a phenomenological model for the nonlinear Seebeck effect incorporating the spin-current induced modulation of the Seebeck coefficient, which well reproduces the experimental results. |
| title | Nonlinear Seebeck effect in Ni$_{81}$Fe$_{19}$|Pt at room temperature |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2507.03249 |