Mode degeneracy due to vortex core removal in magnetic disks
Mode degeneracy due to vortex core removal in magnetic disks
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DOI：
10.1103/physrevb.76.014416
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发表时间：
2007-07-01
影响因子：
3.7
通讯作者：
Back, C. H.
中科院分区：
文献类型：
--
作者：
Hoffmann, F.;Woltersdorf, G.;Back, C. H.
利用时间分辨扫描克尔显微镜研究了具有涡旋基态的微米级铁磁坡莫合金盘的模谱。的磁化强度的时间演变后，探讨应用程序的快速面内场脉冲。最低阶的方位角模式，一个模式，只有一个直径节点，分裂成一个双重光盘直径减小。理论模型表明，这种分裂是模式与涡核的回旋运动相互作用的结果。我们的实验和微磁模拟证实，通过从盘中移除涡核，模式分裂消失。
The mode spectrum of micrometer-sized ferromagnetic Permalloy disks, exhibiting a vortex ground state, is investigated by means of time-resolved scanning Kerr microscopy. The temporal evolution of the magnetization is probed after application of a fast in-plane field pulse. The lowest order azimuthal mode, a mode with only one diametric node, splits into a doublet as the disk diameter decreases. Theoretical models show that this splitting is a consequence of the interaction of the mode with the gyrotropic motion of the vortex core. Our experiments and micromagnetic simulations confirm that by removing the vortex core from the disk, the mode splitting vanishes.