Dynamics of Coupled Vortices in a Pair of Ferromagnetic Disks
Dynamics of Coupled Vortices in a Pair of Ferromagnetic Disks
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DOI：
10.1103/physrevlett.106.197203
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发表时间：
2011-05-13
影响因子：
8.6
通讯作者：
Otani, YoshiChika
中科院分区：
文献类型：
--
作者：
Sugimoto, Satoshi;Fukuma, Yasuhiro;Otani, YoshiChika
本文通过实验证明了耦合涡的旋转模式可以主要由一对具有可变间距的铁磁圆盘中的交流电流共振激发。唯一的回转模式通过偶极相互作用清楚地分裂成较高和较低频率模式，其中主模式分裂是由于耦合涡旋的回转中的手性敏感相位差，而分裂的幅度由它们的极性配置确定。这些实验结果表明，耦合对涡的行为类似于一个双原子分子的成键和反键状态，这意味着磁振子链或阵列中的磁振子带结构的设计的可能性。
We here experimentally demonstrate that gyration modes of coupled vortices can be resonantly excited primarily by the ac current in a pair of ferromagnetic disks with variable separation. The sole gyration mode clearly splits into higher and lower frequency modes via dipolar interaction, where the main mode splitting is due to a chirality sensitive phase difference in gyrations of the coupled vortices, whereas the magnitude of the splitting is determined by their polarity configuration. These experimental results show that the coupled pair of vortices behaves similar to a diatomic molecule with bonding and antibonding states, implying a possibility for designing the magnonic band structure in a chain or an array of magnetic vortex oscillators.