Sensor free, self regulating thermal switching via anomalous Ettingshausen effect and spin reorientation in DyCo5
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2025
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| author | Wang, Shibo Tsuchiura, Hiroki Terakado, Nobuaki |
| author_facet | Wang, Shibo Tsuchiura, Hiroki Terakado, Nobuaki |
| contents | We propose a sensor free, self regulating thermal switch that combines the anomalous Ettingshausen effect (AEE) with a temperature driven spin reorientation transition (SRT) in the rare earth cobalt compound DyCo$_5$. Using density functional theory and the Kubo linear-response formalism, we compute the anomalous Hall conductivity $σ_{xy}(\varepsilon)$ and the finite temperature anomalous Nernst conductivity $α_{xy}(T)$ for two magnetization directions, magnetization parallel and perpendicular to the crystallographic c axis. While the intrinsic $σ_{xy}$ at the Fermi level remains sizable for both orientations, $α_{xy}$ exhibits an about two orders of magnitude contrast in the SRT temperature window. This contrast is consistent with the low temperature Mott relation through the energy slope $\partial_\varepsilon σ_{xy}(\varepsilon)\rvert_{E_{\mathrm F}}$ and is traced to strongly peaked Berry curvature hot spots generated by spin orbit coupling induced avoided crossings of Co $3d$ bands. Combining $α_{xy}$ with longitudinal transport coefficients, we estimate device level metrics, namely the anomalous Nernst thermopower $S_{\mathrm{ANE}}$ and the Ettingshausen coefficient $Π_{\mathrm{AEE}}=T S_{\mathrm{ANE}}$, and demonstrate robust orientation controlled switching under a fixed in plane bias current. These results establish a materials based route to compact thermal control without external sensors or feedback electronics and provide a concrete example that the proposed principle can be realized in an existing ferromagnet. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_14335 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Sensor free, self regulating thermal switching via anomalous Ettingshausen effect and spin reorientation in DyCo5 Wang, Shibo Tsuchiura, Hiroki Terakado, Nobuaki Applied Physics Materials Science We propose a sensor free, self regulating thermal switch that combines the anomalous Ettingshausen effect (AEE) with a temperature driven spin reorientation transition (SRT) in the rare earth cobalt compound DyCo$_5$. Using density functional theory and the Kubo linear-response formalism, we compute the anomalous Hall conductivity $σ_{xy}(\varepsilon)$ and the finite temperature anomalous Nernst conductivity $α_{xy}(T)$ for two magnetization directions, magnetization parallel and perpendicular to the crystallographic c axis. While the intrinsic $σ_{xy}$ at the Fermi level remains sizable for both orientations, $α_{xy}$ exhibits an about two orders of magnitude contrast in the SRT temperature window. This contrast is consistent with the low temperature Mott relation through the energy slope $\partial_\varepsilon σ_{xy}(\varepsilon)\rvert_{E_{\mathrm F}}$ and is traced to strongly peaked Berry curvature hot spots generated by spin orbit coupling induced avoided crossings of Co $3d$ bands. Combining $α_{xy}$ with longitudinal transport coefficients, we estimate device level metrics, namely the anomalous Nernst thermopower $S_{\mathrm{ANE}}$ and the Ettingshausen coefficient $Π_{\mathrm{AEE}}=T S_{\mathrm{ANE}}$, and demonstrate robust orientation controlled switching under a fixed in plane bias current. These results establish a materials based route to compact thermal control without external sensors or feedback electronics and provide a concrete example that the proposed principle can be realized in an existing ferromagnet. |
| title | Sensor free, self regulating thermal switching via anomalous Ettingshausen effect and spin reorientation in DyCo5 |
| topic | Applied Physics Materials Science |
| url | https://arxiv.org/abs/2512.14335 |