We propose a class of metamaterials in which propagation of acoustic waves is controlled magnetically through magnetoelastic coupling. The metamaterials are formed by a periodic array of thin magnetic layers ('resonators') embedded in a non-magnetic matrix. Acoustic waves carrying energy through the structure hybridize with the magnetic modes of the resonators ('Fano resonance'). This leads to a rich set of effects, enhanced by Bragg scattering and being most pronounced when the magnetic resonance frequency is close to or lies within acoustic band gaps. The acoustic reflection from the structure exhibits magnetically induced transparency and Borrmann effect. Our analysis shows that the combined effect of the Bragg scattering and Fano resonance may overcome the magnetic damping ubiquitous in realistic systems. This paves a route towards application of such structures in wave computing and signal processing

中文翻译：

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用于超声控制的混合磁声超材料

我们提出了一类超材料，其中声波的传播通过磁弹性耦合进行磁性控制。超材料由嵌入非磁性基质中的薄磁性层（“谐振器”）的周期性阵列形成。通过结构携带能量的声波与谐振器的磁模式混合（“法诺共振”）。这导致了一系列丰富的效果，由布拉格散射增强，并且在磁共振频率接近或位于声带隙内时最为明显。来自该结构的声反射表现出磁感应透明度和 Borrmann 效应。我们的分析表明，布拉格散射和法诺共振的组合效应可以克服现实系统中普遍存在的磁阻尼。