Ultrafast spin dynamics across compensation points in ferrimagnetic GdFeCo: The role of angular momentum compensation
Ultrafast spin dynamics across compensation points in ferrimagnetic GdFeCo: The role of angular momentum compensation
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DOI：
10.1103/physrevb.73.220402
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发表时间：
2006-06-01
影响因子：
3.7
通讯作者：
Rasing, T
中科院分区：
文献类型：
--
作者：
Stanciu, CD;Kimel, AV;Rasing, T
利用全光泵浦和探测技术，研究了亚铁磁非晶GdFeCo薄膜的超快磁响应随温度的变化关系。当样品温度接近角动量补偿点时，磁化旋进的频率和吉尔伯特阻尼参数都显著增加。此外，高频交换模式软化，变得可观察。在角动量补偿附近观察到的高速和强阻尼自旋动力学对于磁和磁光记录中的超快无振铃进动切换是理想的。
Using an all-optical pump and probe technique, we have investigated the temperature dependence of the ultrafast magnetic response in a ferrimagnetic amorphous GdFeCo thin film. When the temperature of the sample approaches the angular momentum compensation point, both frequency and the Gilbert damping parameter of the magnetization precession increase significantly. In addition, the high-frequency exchange mode softens and becomes observable. The observed high-speed and strongly damped spin dynamics in the vicinity of the compensation of the angular momentum is ideal for ultrafast ringing-free precessional switching in magnetic and magneto-optical recording.