论文标题
垂直曲折的Cofeb薄膜中的镁质带结构
Magnonic band structure in vertical meander-shaped CoFeB thin films
论文作者
论文摘要
Brillouin光散射光谱研究研究了自旋波在垂直蜿蜒形的COFEB薄膜中的分散体，该薄膜由位于90°角的片段组成。我们揭示了几个分散分支的周期性特征以及交替的频率范围，其中允许或禁止旋转波。值得注意的是，仅针对波数k = n $π$/a，每个连续的模式之间存在频带差距，其中n是一个均匀的整数，而a是曲折单元单元的大小，而光谱显示其他aveNumumbers的正交膜段中的传播模式。微磁模拟和分析计算使我们能够从模式的空间定位和对称性来理解和解释结果。获得的结果证明了在三个维度上的波传播开为信号处理的多层次宏伟架构的路径。
The dispersion of spin waves in vertical meander-shaped CoFeB thin films consisting of segments located at 90° angles with respect to each other is investigated by Brillouin light scattering spectroscopy. We reveal the periodic character of several dispersive branches as well as alternating frequency ranges where spin waves are allowed or forbidden to propagate. Noteworthy is the presence of the frequency band gaps between each couple of successive modes only for wave numbers k=n$π$/a, where n is an even integer number and a is the size of the meander unit cell, whereas the spectra show propagating modes in the orthogonal film segments for the other wavenumbers. The micromagnetic simulations and analytical calculations allow us to understand and explain the results in terms of the mode spatial localization and symmetry. The obtained results demonstrate the wave propagation in three dimensions opening the path for multi-level magnonic architectures for signal processing.
