标题： 自旋波在双周期磁性晶体中的传播 显示英文标题

标题： Propagation of Spin Waves in Doubly Periodic Magnonic Crystals

摘要： 为了开发针对磁振子晶体中自旋波带隙调控的策略，本工作研究了一种具有双重周期性的一维磁振子晶体的带隙特性。一块长而窄的钇铁石榴石（YIG）薄膜条带被蚀刻成一系列横向沟槽线，这些沟槽线之间的距离交替变化，其中第二个距离是第一个距离的两倍。这种磁振子晶体中的双重周期性在频率域内转化为不同的带隙，其中第三和第六个带隙比其他带隙更为明显。这些带隙之所以更明显，是因为相应的波数同时满足两个沟槽间距及其总和所对应的布拉格散射条件。实验观察结果通过数值模拟得到了再现。实验和数值结果一起表明，多重周期性可以作为有效设计参数，用于制造具有所需带隙的磁振子晶体。 显示英文摘要

摘要： Towards the development of strategies for tailoring spin-wave band gaps in magnonic crystals, this work examines the band gap properties in a one-dimensional magnonic crystal with double periodicity. A long and narrow yttrium iron garnet (YIG) thin film strip is etched with an array of transverse groove lines separated by alternating distances, where the second distance is twice the first. This double periodicity in the magnonic crystal translates into dissimilar band gaps in the frequency domain, with the third and sixth band gaps being more pronounced than others. These band gaps are more pronounced because the corresponding wavenumbers simultaneously satisfy the Bragg scattering conditions for the periods equal to the two groove separations as well as their sum. Experimental observations are reproduced by numerical simulations. Together, the experimental and numerical results demonstrate how multiple periodicities could be an effective design parameter for creating magnonic crystals with desired band gaps.