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Gyrotropic frequencies of pinned vortices in magnetic nanodisks

机译：磁性纳米盘中固定涡旋的回旋频率

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Recent experimental data have indicated that magnetic vortices can be pinned to an impurity at the surface of a nanodisk. Unpinned vortices exhibit a gyrotropic precession frequency that is approximately proportional to the aspect ratio of the disk, L/R, where L and R are the disk thickness and radius, respectively. More recent experimental data have indicated that the gyrotropic frequency of pinned vortices has an approximate R/L dependence for the thin disk, and the vortex is pinned at only one surface of the disk. Pinning of the vortex to one surface of the disk results in a significant contribution to the exchange energy which is used along with the magnetostatic energy in the Thiele equation to calculate the frequency. This energy results in the R/L dependence as seen in experimental thin disk measurements.
机译：最近的实验数据表明，磁涡流可以固定在纳米盘表面的杂质上。非固定涡旋的回旋进动频率大约与圆盘的纵横比L / R成比例，其中L和R分别是圆盘的厚度和半径。最新的实验数据表明，固定涡旋的回旋频率对薄盘具有近似的R / L依赖性，并且涡旋仅固定在圆盘的一个表面上。将涡旋钉在圆盘的一个表面上会极大地影响交换能量，该交换能量与静磁能量一起在Thiele方程中用于计算频率。如实验薄盘测量中所见，此能量导致R / L依赖性。

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