Reconfigurable magnonic mode-hybridisation and spectral control in a bicomponent artificial spin ice.
Reconfigurable magnonic mode-hybridisation and spectral control in a bicomponent artificial spin ice.
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DOI：
10.1038/s41467-021-22723-x
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发表时间：
2021-05-03
影响因子：
16.6
通讯作者：
Branford WR
中科院分区：
文献类型：
--
作者：
Gartside JC;Vanstone A;Dion T;Stenning KD;Arroo DM;Kurebayashi H;Branford WR
强相互作用的纳米磁性阵列越来越多地被用作可重新配置磁振子的模型宿主系统。由于偶极场格局的变化，元素间的强耦合允许在广泛的微态空间上产生明显的光谱差异。虽然这些系统已经取得了令人印象深刻的初步结果，但开发快速、可扩展的手段来访问广泛的光谱不同的微态是一个开放的研究问题。我们提出了一种方案，通过相对于阵列的其余部分加宽条子集来修改正方形人工自旋冰，从而允许通过简单的全局场协议来准备任何有序的顶点状态。可用的微态范围从系统的基态到高能的‘单极子’态，观察到了丰富而独特的微态特有的磁振子光谱。在剩磁和场强下都观察到了微态相关的模式杂化和反交叉现象，动态耦合强度可通过微态选择来调节。实验测得的耦合强度高达g/2π = 0.16 GHz。微状态控制允许精细的模式频移、间隙创建和关闭以及活动模式编号选择。可重构磁子晶体(RMC)由磁性元件的纳米图形阵列组成，可以容纳多种光谱不同的微态，具有巨大的功能磁振子的潜力。在这里，Gartside等人提出了一种具有四个不同微态的RMC，具有不同的磁振子性质，并显示出可重构的磁振子模式杂化。
Strongly-interacting nanomagnetic arrays are finding increasing use as model host systems for reconfigurable magnonics. The strong inter-element coupling allows for stark spectral differences across a broad microstate space due to shifts in the dipolar field landscape. While these systems have yielded impressive initial results, developing rapid, scaleable means to access a broad range of spectrally-distinct microstates is an open research problem. We present a scheme whereby square artificial spin ice is modified by widening a ‘staircase’ subset of bars relative to the rest of the array, allowing preparation of any ordered vertex state via simple global-field protocols. Available microstates range from the system ground-state to high-energy ‘monopole’ states, with rich and distinct microstate-specific magnon spectra observed. Microstate-dependent mode-hybridisation and anticrossings are observed at both remanence and in-field with dynamic coupling strength tunable via microstate-selection. Experimental coupling strengths are found up to g/2π = 0.16 GHz. Microstate control allows fine mode-frequency shifting, gap creation and closing, and active mode number selection. Reconfigurable magnonic crystals (RMC), comprising nano-patterned arrays of magnetic elements, can host a wide variety of spectrally-distinct microstates with great potential for functional magnonics. Here, Gartside et al, present an RMC with four distinct microstates, possessing diverse magnonic properties and exhibiting reconfigurable magnon mode hybridisation.
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影响因子：
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