论文标题
带有非马克维亚阻尼的小磁铁的进液动力学：实验确定相关时间的理论建议
Precession dynamics of a small magnet with non-Markovian damping: Theoretical proposal for an experiment to determine the correlation time
论文作者
论文摘要
实验技术的最新进展使得在飞秒时间尺度上操纵和测量磁化动力学成为可能，这与浴室自由度的相关时间相同。在磁化运动方程式中，浴缸的相关性由非马克维亚阻尼表示。对于基于超快磁化动力学的科学和技术的开发，重要的是要了解磁化动力学如何取决于相关时间。通过实验确定相关时间也很重要。在这里，我们研究了一个小磁铁的进动动态，并使用非马克维亚阻尼。扩展了宫崎骏和Seki的理论分析[J.化学物理。 108，7052（1998）]我们获得了针对角速度的分析表达式和在小吉尔伯特阻尼常数下的相关时间值的任何值的有效阻尼常数。我们还提出了一个可能确定相关时间的实验。
Recent advances in experimental techniques have made it possible to manipulate and measure the magnetization dynamics on the femtosecond time scale which is the same order as the correlation time of the bath degrees of freedom. In the equations of motion of magnetization, the correlation of the bath is represented by the non-Markovian damping. For development of the science and technologies based on the ultrafast magnetization dynamics it is important to understand how the magnetization dynamics depend on the correlation time. It is also important to determine the correlation time experimentally. Here we study the precession dynamics of a small magnet with the non-Markovian damping. Extending the theoretical analysis of Miyazaki and Seki [J. Chem. Phys. 108, 7052 (1998)] we obtain analytical expressions of the precession angular velocity and the effective damping constant for any values of the correlation time under assumption of small Gilbert damping constant. We also propose a possible experiment for determination of the correlation time.
