Eigenmodes of 1-kink skyrmions in cylindrical magnetic discs
Eigenmodes of 1-kink skyrmions in cylindrical magnetic discs
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DOI：
10.1016/j.jmmm.2024.171761
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发表时间：
2024-02
影响因子：
2.7
通讯作者：
T. L. Staggers;Shawn D. Pollard
中科院分区：
文献类型：
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作者：
T. L. Staggers;Shawn D. Pollard
用微磁模拟方法研究了嵌入Néel Skyrmion形成1-扭结Skyrmion的磁区壁Skrmion的稳定性和共振谱。我们证明了在中等强度的Dzyaloshinskii-Moriya相互作用下，1-扭结的Skyrmion在很大范围内是稳定的。通过用宽带磁场激励这些结构，我们发现复杂的共振行为与纯Néel Skyrmion的行为不同。对于面外激发，相对于Néel天米子，1-扭结天米子在振幅减小时表现出一个附加模。这些模式包括与嵌入的磁区壁天线的呼吸模式和振荡相关联的低频和高频模式。在面内激发后，Néel和1-kink Skyrmions都表现出频率相似的逆时针旋转模式，以及与结构与铁磁背景态相互作用相关的更高频率的模式。这些结果可能为探索更复杂的磁基微波器件的自旋结构铺平道路。
The stability and resonance spectra associated with a domain wall skyrmion embedded within a Néel skyrmion, forming a 1-kink skyrmion, has been studied using micromagnetic simulations. We show that the 1-kink skyrmion is stable over a wide range of fields at moderate strengths of the Dzyaloshinskii-Moriya interaction. By exciting these structures with a broadband magnetic field excitation, we find complex resonance behavior deviating from that of a pure Néel skyrmion. For out-of-plane excitations, the 1-kink skyrmion demonstrates an additional mode relative to that of the Néel skyrmion at reduced amplitude. These consist of low frequency and high frequency modes associated with both a breathing mode and an oscillation of the embedded domain wall skyrmion. Following an in-plane excitation, both Néel and 1-kink skyrmions exhibit a counterclockwise rotational mode with similar frequencies, as well as a higher frequency mode associated with the interaction of the structure with the ferromagnetic background state. These results may help pave the way for exploration of more complex spin structures for magnetic-based microwave devices.