超快自旋动力学：色噪声的影响
Ultra-fast spin dynamics: the effect of colored noise
摘要：
最近的实验结果已经将磁化动力学的极限推到了皮秒和飞秒的时间尺度。这种超快的自旋动力学发生在强而快速变化的磁场和高温的极端条件下。这种情况需要新的磁化动力学的描述，即使在原子朗道-Lifshitz-吉尔伯特方程的唯象水平上，考虑到电子系统的相关时间可以是反特征自旋频率的顺序。在这种情况下，我们介绍了基于Landau-Lifshitz-Miyasaki-Seki方程的自旋动力学的唯象正确的方法。研究了噪声关联时间对纵向和横向磁化弛豫的影响。我们还展示了噪声相关时间对不同材料在激光诱导动力学过程中的退磁速率的影响。
英文摘要：
Recent experimental results have pushed the limits of magnetization dynamics to pico- and femtosecond timescales. This ultra-fast spin dynamics occurs in extreme conditions of strong and rapidly varying fields and high temperatures. This situation requires new description of magnetization dynamics, even on a phenomenological level of the atomistic Landau-Lifshitz-Gilbert equation, taking into account that the correlation time for electron system could be of the order of the inverse characteristic spin frequency. For this case we introduce the thermodynamically correct phenomenological approach for spin dynamics based on the Landau-Lifshitz-Miyasaki-Seki equation. The influence of the noise correlation time on longitudinal and transverse magnetization relaxation is investigated. We also demonstrate the effect of the noise correlation time on demagnetisation rate of different materials during laser-induced dynamics.
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