Inertial Spin Dynamics in Epitaxial Cobalt Films.
Inertial Spin Dynamics in Epitaxial Cobalt Films.
复制标题
外延钴薄膜中的惯性自旋动力学。
DOI：
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发表时间：
2021
影响因子：
8.6
通讯作者：
S. Bonetti
中科院分区：
文献类型：
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作者：
V. Unikandanunni;R. Medapalli;M. Asa;E. Albisetti;D. Petti;R. Bertacco;E. Fullerton;S. Bonetti
研究了太赫兹磁场驱动下钴外延薄膜中三个晶相的自旋动力学。太赫兹磁场在磁化时产生一个扭矩，使其进动约1ps，与驱动力的时间滞后为亚皮秒。然后，磁化以晶体相的频率特征经历自然阻尼太赫兹振荡。我们描述了求解惯性Landau-Lifshitz-Gilbert方程的实验观测。利用磁惯性相对论的结果，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与磁晶各向异性的强度成正比。
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 subpicosecond 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 magnetocrystalline anisotropy.
影响因子：
16.6
作者：
Razdolski I;Alekhin A;Ilin N;Meyburg JP;Roddatis V;Diesing D;Bovensiepen U;Melnikov A
通讯作者：
Melnikov A