论文标题
磁弹性相互作用启用的表面声波的巨大非副本
Giant Nonreciprocity of Surface Acoustic Waves enabled by the Magnetoelastic Interaction
论文作者
论文摘要
通常，由于大多数物理系统结合了防止效果的对称性，因此通常难以实现隔离器，循环器和许多其他应用的定义特征。特别是，声波是信息传输的重要媒介，但它们在时间上固有地对称。在这项工作中，我们报告了涂有铁磁铁/绝缘体/非绝缘体/铁磁铁（FEGAB/AL2O3/FEGAB）多层结构的Niobate底物上表面声波（SAWS）的巨大非同性恋。我们用独特的不对称带图利用这种新颖的结构，并在磁弹性耦合理论上扩展，以显示磁带对仅在单个方向上与声波的夫妇如何。我们测量48.4 dB（1：100,000）的隔离，在新型的声波系统中，隔离量优于当前的微波隔离器设备，从而促进了前所未有的尺寸，重量和功率降低。此外，这些结果还提供了一个有前途的平台来研究非注射锯设备。
Nonreciprocity, the defining characteristic of isolators, circulators and a wealth of other applications in radio/microwave communications technologies, is in general difficult to achieve as most physical systems incorporate symmetries that prevent the effect. In particular, acoustic waves are an important medium for information transport, but they are inherently symmetric in time. In this work, we report giant nonreciprocity in the transmission of surface acoustic waves (SAWs) on lithium niobate substrate coated with ferromagnet/insulator/ferromagnet (FeGaB/Al2O3/FeGaB) multilayer structure. We exploit this novel structure with a unique asymmetric band diagram, and expand on magnetoelastic coupling theory to show how the magnetic bands couple with acoustic waves only in a single direction. We measure 48.4 dB (ratio of 1:100,000) isolation which outperforms current state of the art microwave isolator devices in a novel acoustic wave system that facilitates unprecedented size, weight, and power reduction. Additionally, these results offer a promising platform to study nonreciprocal SAW devices.
