外延钴薄膜中的惯性自旋动力学
Inertial spin dynamics in epitaxial cobalt films
摘要：
研究了太赫兹磁场作用下三种晶相钴外延薄膜的自旋动力学。太赫兹磁场在磁化上产生扭矩，该扭矩使其进动约1 ps，与驱动力具有亚皮秒的时间滞后。然后，磁化强度在晶相的频率特性下经历自然阻尼THz振荡。我们描述的实验观察解决惯性Landau-Lifshitz-Gilbert方程。利用相对论性磁惯量理论的结果，我们发现角动量弛豫时间$η$是描述所有实验证据所需的唯一材料参数。我们的实验表明，$η$和磁晶各向异性的强度之间的比例。
英文摘要：
We investigate the spin dynamics driven by terahertz magnetic fields in epitaxial thin films of cobalt in its three crystalline phases. The terahertz magnetic field generates a torque on the magnetization which causes it to precess for about 1 ps, with a sub-picosecond temporal lag from the driving force. Then, the magnetization undergoes natural damped THz oscillations at a frequency characteristic of the crystalline phase. We describe the experimental observations solving the inertial Landau-Lifshitz-Gilbert equation. Using the results from the relativistic theory of magnetic inertia, we find that the angular momentum relaxation time $η$ is the only material parameter needed to describe all the experimental evidence. Our experiments suggest a proportionality between $η$ and the strength of the magneto-crystalline anisotropy.
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