Thermal Spin Waves from Accelerating Domain Walls via the Unruh Effect
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| Format: | Preprint |
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2025
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| _version_ | 1866911315744784384 |
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| author | Bassant, A. L. Duine, R. A. |
| author_facet | Bassant, A. L. Duine, R. A. |
| contents | We consider a wire consisting of a conducting ferromagnetic layer and an insulating antiferromagnetic layer that are coupled. The ferromagnet hosts a domain wall, which is dynamically driven by a charge current. We show that for a specific time-dependent current, the domain wall moves according to a Rindler trajectory. This motion excites spin waves in the antiferromagnetic insulator, and their emission spectrum is characterised by an effective temperature analogous to the Unruh temperature, $T_U = \hbar a/2πc k_B$, with a the acceleration of the domain wall, c the maximum antiferromagnetic spin wave velocity, and kB the Boltzmann constant. This thermal signature is a direct consequence of the Unruh effect and could be experimentally observed. Our results establish magnetism as a promising platform for probing relativistic quantum field phenomena. Moreover, since the Unruh effect is inherently linked to entanglement, our proposal provides a route for entangling magnetic domain walls via relativistic effects. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_11387 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Thermal Spin Waves from Accelerating Domain Walls via the Unruh Effect Bassant, A. L. Duine, R. A. Mesoscale and Nanoscale Physics General Relativity and Quantum Cosmology We consider a wire consisting of a conducting ferromagnetic layer and an insulating antiferromagnetic layer that are coupled. The ferromagnet hosts a domain wall, which is dynamically driven by a charge current. We show that for a specific time-dependent current, the domain wall moves according to a Rindler trajectory. This motion excites spin waves in the antiferromagnetic insulator, and their emission spectrum is characterised by an effective temperature analogous to the Unruh temperature, $T_U = \hbar a/2πc k_B$, with a the acceleration of the domain wall, c the maximum antiferromagnetic spin wave velocity, and kB the Boltzmann constant. This thermal signature is a direct consequence of the Unruh effect and could be experimentally observed. Our results establish magnetism as a promising platform for probing relativistic quantum field phenomena. Moreover, since the Unruh effect is inherently linked to entanglement, our proposal provides a route for entangling magnetic domain walls via relativistic effects. |
| title | Thermal Spin Waves from Accelerating Domain Walls via the Unruh Effect |
| topic | Mesoscale and Nanoscale Physics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2512.11387 |