变面密度纳米磁体有序阵列皮秒动力学的全光激发与探测
All-Optical Excitation and Detection of Picosecond Dynamics of Ordered Arrays of Nanomagnets with Varying Areal Density
摘要：
我们已经证明了光激发和检测的集体进动动力学耦合Ni80Fe20（坡莫合金）纳米元素的阵列与系统地改变面密度的全光学时间分辨克尔显微镜。我们已经应用这种技术来精确地确定这些阵列中的三个不同的集体制度。在非常高的面密度，一个单一的统一的集体模式被观察到的组成元素的边缘模式被抑制。在中间的面密度，三个不均匀的集体模式出现，并在非常低的面密度，我们观察到非集体动力学和只有中心和边缘模式的组成元素出现。
英文摘要：
We have demonstrated optical excitation and detection of collective precessional dynamics in arrays of coupled Ni80Fe20 (permalloy) nanoelements with systematically varying areal density by an all-optical time-resolved Kerr microscope. We have applied this technique to precisely determine three different collective regimes in these arrays. At very high areal density, a single uniform collective mode is observed where the edge modes of the constituent elements are suppressed. At intermediate areal densities, three nonuniform collective modes appear and at very low areal density, we observe noncollective dynamics and only the centre and edge modes of the constituent elements appear.
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