人工自旋-冰结构和扩展NiFe底层磁混合系统中的动力学耦合和自旋波色散
Dynamic coupling and spin-wave dispersions in a magnetic hybrid system made of an artificial spin-ice structure and an extended NiFe underlayer
摘要：
我们提出了一个结合实验和数值模拟研究的自旋波色散在镍铁人工自旋冰（ASI）系统组成的一个阵列的体育场形的纳米岛沉积在一个连续的镍铁薄膜的顶部与不同厚度的间隔层。在Damon-Eshbach结构中，通过波矢分辨布里渊光散射光谱测量的自旋波色散由丰富数量的模式组成，具有静止或传播特性。我们发现，最低频率模式显示约0.5 GHz的带宽，这是独立的存在下的膜。相反，一些检测到的模式的BLS强度强烈依赖于扩展的薄膜底层的存在。微磁学模拟揭示了ASI晶格和薄膜底层之间动态耦合的细节。有趣的是，ASI晶格有利于膜的动态特性，无论是特定的波长还是压印在膜中的ASI元素的模式特有的强度调制。我们的结果表明，传播的自旋波可以调制在纳米尺度上通过利用动态模式耦合在垂直，即，适当设计的磁振子结构的平面外方向。
英文摘要：
We present a combined experimental and numerical study of the spin-wave dispersion in NiFe artificial spin-ice (ASI) system consisting of an array of stadium-shaped nanoislands deposited on the top of a continuous NiFe film with nonmagnetic spacer layers of varying thickness. The spin-wave dispersion, measured by wavevector resolved Brillouin light scattering spectroscopy in the Damon-Eshbach configuration, consists of a rich number of modes, with either stationary or propagating character. We find that the lowest frequency mode displays a bandwidth of approximately 0.5 GHz, which is independent of the presence of the film underneath. On the contrary, the BLS intensity of some of the detected modes strongly depends on the presence of the extended thin-film underlayer. Micromagnetic simulations unveil the details of the dynamic coupling between ASI lattice and film underlayer. Interestingly, the ASI lattice facilitates dynamics of the film either specific wavelengths or intensity modulation peculiar to the modes of the ASI elements imprinted in the film. Our results demonstrate that propagating spin waves can be modulated at the nanometer length scale by harnessing the dynamic mode coupling in the vertical, i.e., the out-of-plane direction of suitably designed magnonic structures.
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