Gyration mode splitting in magnetostatically coupled magnetic vortices in an array
Gyration mode splitting in magnetostatically coupled magnetic vortices in an array
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DOI：
10.1088/0022-3727/43/42/422001
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发表时间：
2010-10-27
影响因子：
3.4
通讯作者：
Otani, Y.
中科院分区：
文献类型：
--
作者：
Barman, Anjan;Barman, Saswati;Otani, Y.
我们在由直径为 1 μm、厚度为 50 nm、盘间间距在 150 至 270 nm 之间变化的静磁耦合 Ni81Fe19 圆盘组成的阵列中，通过时间分辨磁光克尔效应进行了回转模式分裂的实验观察。当盘间间距为 200 nm 或更小时，可以观察到涡旋核心回转模式的分裂，并且分裂可由偏置磁场控制。观察到的模式分裂通过微磁模拟解释为类似于耦合经典振荡器的涡核的正常模式。分裂取决于磁性侧电荷介导的盘间静磁耦合的强度，这在很大程度上取决于样品的磁性基态。
We present the experimental observation of gyration mode splitting by the time-resolved magneto-optical Kerr effect in an array consisting of magnetostatically coupled Ni81Fe19 discs of 1 mu m diameter, 50 nm thickness and inter-disc separations varying between 150 and 270 nm. A splitting of the vortex core gyration mode is observed when the inter-disc separation is 200 nm or less and the splitting is controllable by a bias magnetic field. The observed mode splitting is interpreted by micromagnetic simulations as the normal modes of the vortex cores analogous to the coupled classical oscillators. The splitting depends upon the strength of the inter-disc magnetostatic coupling mediated by magnetic side charges, which depends strongly on the magnetic ground states of the samples.