Coupling Characteristics of Point Defect States in Two-dimensional Magnonic Crystals

信息记录材料 Pub Date : 2012-01-01 DOI:10.7498/aps.61.117501

Cao Yong-jun

引用次数: 0

Abstract

Using the plane-wave expansion method under supercell approximation,band structures of spin waves propagating with coupling characteristics between point defects in 2-D magnonic crystals are calculated.The results indicate that the point defects in these structures can create localized states inside the band gap.The characteristics and the magnetization distributions of these localized states are studied.It shows that the group velocities of the localized states almost equal to zero in the whole first Brillouin zone,and numbers of localized states and theirs frequency-positions in the band gap are related to the size of the point defect.These characteristics of coupling between localized magnonic crystals are referential to the research on directional the fabricating materials of narrow bandpass spin-wave filters.

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二维磁振子晶体中点缺陷态的耦合特性

利用超胞近似下的平面波展开法，计算了二维磁子晶体中具有点缺陷耦合特性的自旋波的能带结构。结果表明，这些结构中的点缺陷可以在带隙内产生局域态。研究了这些局域态的特性和磁化分布。结果表明，局域态的群速度在整个第一布里渊区几乎等于零，局域态的数量及其在带隙中的频率位置与点缺陷的大小有关。这些局域磁晶体间耦合的特性对窄带通自旋波滤波器的定向制备材料的研究具有一定的参考价值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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信息记录材料

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