Kavli Affiliate: Mamoru Matsuo
| First 5 Authors: Tetsuya Sato, Shinichi Watanabe, Mamoru Matsuo, Takeo Kato,
| Summary:
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.
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