Activation of additional energy dissipation processes in the magnetization dynamics of epitaxial chromium dioxide films
Activation of additional energy dissipation processes in the magnetization dynamics of epitaxial chromium dioxide films
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DOI：
10.1103/physrevb.77.020412
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发表时间：
2007-10
影响因子：
3.7
通讯作者：
G. Muller;M. Munzenberg;G. Miao;A. Gupta
中科院分区：
文献类型：
--
作者：
G. Muller;M. Munzenberg;G. Miao;A. Gupta
在全光泵浦-探测装置中研究了二氧化铬（100）薄膜的旋进磁化动力学。利用频率对外场的依赖关系提取单轴面内各向异性常数。阻尼表现出很强的依赖于频率，但也对激光泵浦能量密度，这是揭示了在这项工作中的一个重要的实验参数：高于一定的阈值，进一步的能量耗散通道打开和阻尼急剧增加。这种行为可能源于自旋波不稳定性。
The precessional magnetization dynamics of a chromium dioxide (100) film is examined in an all-optical pump-probe setup. The frequency dependence on the external field is used to extract the uniaxial in-plane anisotropy constant. The damping shows a strong dependence on the frequency, but also on the laser pump fluence, which is revealed as an important experimental parameter in this work: above a certain threshold further channels of energy dissipation open and the damping increases sharply. This behavior might stem from spin-wave instabilities.