Picosecond magnetization dynamics in nanomagnets: Crossover to nonuniform precession
Picosecond magnetization dynamics in nanomagnets: Crossover to nonuniform precession
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DOI：
10.1103/physrevb.71.220409
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发表时间：
2005-06-01
影响因子：
3.7
通讯作者：
Katine, JA
中科院分区：
文献类型：
--
作者：
Kruglyak, VV;Barman, A;Katine, JA
采用光抽运-探测方法研究了正方形Ni 88 Fe 12/Co 80 Fe 20双层纳米元件阵列的皮秒磁化动力学。实验观察到的模式被发现落在两个分支上，随着元件尺寸减小到小于220 nm，从高频率到低频率的区域发生交叉。微磁学模拟显示，分支与中心和边缘模式。边缘模式被发现占主导地位的元件尺寸减小，使磁响应的脉冲场变得不那么空间均匀。
The picosecond magnetization dynamics of arrays of square Ni88Fe12/Co80Fe20 bilayer nanoelements were studied by optical pump-probe measurements. Experimentally observed modes were found to fall upon two branches, with a crossover from the high- to low-frequency regime as the element size was reduced to less than 220 nm. Micromagnetic simulations revealed that the branches are associated with center and edge modes. The edge mode is found to dominate as the element size is reduced so that the magnetic response to a pulsed field becomes less spatially uniform.