Fluctuations in Spin Dynamics Excited by Pulsed Light
Fuente:
arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
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| _version_ | 1866910901854011392 |
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| author | Sato, Tetsuya Watanabe, Shinichi Matsuo, Mamoru Kato, Takeo |
| author_facet | Sato, Tetsuya Watanabe, Shinichi Matsuo, Mamoru Kato, Takeo |
| contents | We theoretically investigate nonequilibrium spin fluctuations in a ferromagnet induced by a light pulse. Using a Lindblad equation consistent with the Landau-Lifshitz-Gilbert equation, we compute the autocorrelation function of magnetization. Our analysis reveals that this function comprises both thermal and nonequilibrium components. To examine the latter in detail, we introduce a Fano factor similar to nonequilibrium current noise in electronic circuits. We demonstrate that this factor encapsulates insights into the transfer of spin units to the environment. Our findings lay the groundwork for nonequilibrium spin noise spectroscopy, offering valuable insights into spin relaxation dynamics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_10522 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Fluctuations in Spin Dynamics Excited by Pulsed Light Sato, Tetsuya Watanabe, Shinichi Matsuo, Mamoru Kato, Takeo Mesoscale and Nanoscale Physics We theoretically investigate nonequilibrium spin fluctuations in a ferromagnet induced by a light pulse. Using a Lindblad equation consistent with the Landau-Lifshitz-Gilbert equation, we compute the autocorrelation function of magnetization. Our analysis reveals that this function comprises both thermal and nonequilibrium components. To examine the latter in detail, we introduce a Fano factor similar to nonequilibrium current noise in electronic circuits. We demonstrate that this factor encapsulates insights into the transfer of spin units to the environment. Our findings lay the groundwork for nonequilibrium spin noise spectroscopy, offering valuable insights into spin relaxation dynamics. |
| title | Fluctuations in Spin Dynamics Excited by Pulsed Light |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2405.10522 |