Coupled Vortex Oscillations in Spatially Separated Permalloy Squares
Coupled Vortex Oscillations in Spatially Separated Permalloy Squares
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DOI：
10.1103/physrevlett.106.137201
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发表时间：
2011-03-29
影响因子：
8.6
通讯作者：
Meier, Guido
中科院分区：
文献类型：
--
作者：
Vogel, Andreas;Kamionka, Thomas;Meier, Guido
我们通过实验研究了通过杂散场耦合的微米级坡莫合金方块对的磁化动力学。使用时间分辨扫描透射 X 射线显微镜将正方形朗道域图案中涡核的轨迹映射到真实空间中。用短磁场脉冲激励其中一个涡核后，系统的行为类似于耦合谐振子。耦合强度取决于正方形之间的间隔和涡旋核心偏振的配置。考虑到通过旋转面内磁场的激励，可以理解，对于相等的核心极化，仅观察到第二涡核的弱响应。
We experimentally study the magnetization dynamics of pairs of micron-sized permalloy squares coupled via their stray fields. The trajectories of the vortex cores in the Landau-domain patterns of the squares are mapped in real space using time-resolved scanning transmission x-ray microscopy. After excitation of one of the vortex cores with a short magnetic-field pulse, the system behaves like coupled harmonic oscillators. The coupling strength depends on the separation between the squares and the configuration of the vortex-core polarizations. Considering the excitation via a rotating in-plane magnetic field, it can be understood that only a weak response of the second vortex core is observed for equal core polarizations.