Excitations with negative dispersion in a spin vortex -: art. no. 104415
Excitations with negative dispersion in a spin vortex -: art. no. 104415
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DOI：
10.1103/physrevb.71.104415
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发表时间：
2005-03-01
影响因子：
3.7
通讯作者：
Back, CH
中科院分区：
文献类型：
--
作者：
Buess, M;Knowles, TPJ;Back, CH
具有平面内涡状结构的微米级铁磁坡莫合金盘被垂直于平面的快速上升时间磁场脉冲激发。利用时间分辨磁光克尔显微镜和傅里叶变换对激发态进行成像。观察到两种类型的模态：圆节点模态和直径节点模态。圆形节点的模态频率随节点数的增加而增加。相反，具有直径节点的模态频率随着节点数的增加而减小。这种行为可以用一个分析模型准确地解释。
Micron-sized ferromagnetic permalloy disks having an in-plane vortexlike configuration are excited by a fast-rise-time magnetic-field pulse perpendicular to the plane. The excited modes are imaged using time-resolved magneto-optic Kerr microscopy and Fourier transformation. Two types of modes are observed: modes with circular nodes and modes with diametric nodes. The frequency of the modes with circular nodes increases with the number of nodes. In contrast, the frequency of the modes with diametric nodes decreases with the number of nodes. This behavior is explained accurately by an analytical model.