二维磁振子晶体中的非均匀自旋波软化作为打开全向磁振子带隙的工具
Non-uniform spin wave softening in 2D magnonic crystals as a tool for opening omnidirectional magnonic band gaps
摘要：
本文用平面波方法研究了由含钴的坡莫合金薄膜构成的二维压缩六方晶格双组分磁振子晶体中的自旋波动力学。我们探讨了自旋波频率对外部磁场的依赖关系，特别是在弱场模式软化发生。对于所考虑的结构，模式软化被证明是高度不均匀的模式数和波矢量。我们发现这种效应是负责的全向带隙开放。此外，我们表明，由结构的压缩引起的退磁场的增强是至关重要的非均匀模式软化。这使得我们可以利用这种机制来设计对外场的微小变化具有不同灵敏度的磁隙。我们所发现的效应应该是有用的自旋波滤波器的设计和优化高度可调谐的一个小的外部磁场。
英文摘要：
By means of the plane wave method we study spin wave dynamics in two-dimensional bi-component magnonic crystals based on a squeezed hexagonal lattice and consist of a permalloy thin film with cobalt inclusions. We explore the dependence of a spin wave frequency on the external magnetic field, especially in weak fields where the mode softening takes place. For considered structures, the mode softening proves to be highly non-uniform on both the mode number and the wave vector. We found this effect to be responsible for the omnidirectional band gap opening. Moreover, we show that the enhancement of the demagnetizing field caused by the squeezing of the structure is of crucial importance for the non-uniform mode softening. This allows us to employ this mechanism to design magnonic gaps with different sensitivity for the tiny change of the external field. The effects we have found should be useful in designing and optimization of spin wave filters highly tunable by a small external magnetic field.
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