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arXiv 1003.6092cond-mat.mes-hallcond-mat.mtrl-sci
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二维周期性磁振子晶体作为自旋波波导的研究

Magnonic Crystal with Two-Dimensional Periodicity as a Waveguide for Spin Waves

Rakesh P. Tiwari, D. Stroud

摘要:

我们描述了一个简单的方法,包括在自旋波能带结构的周期性铁磁复合材料的耗散,通过求解的Landau-Lifshitz方程的磁化与吉尔伯特阻尼项。我们使用这种方法来计算的能带结构的正方形和三角形阵列的Ni纳米圆柱嵌入在Fe主机。结果表明,在布里渊区存在某些带和特殊的方向,在这些带中自旋波寿命比其平均值增加一个数量级以上。因此,对于${\bf k}$空间中的某些频率和方向,在这种复合物中产生自旋波衰减特别慢,并且传播特别长的距离是可能的。

英文摘要:

We describe a simple method of including dissipation in the spin wave band structure of a periodic ferromagnetic composite, by solving the Landau-Lifshitz equation for the magnetization with the Gilbert damping term. We use this approach to calculate the band structure of square and triangular arrays of Ni nanocylinders embedded in an Fe host. The results show that there are certain bands and special directions in the Brillouin zone where the spin wave lifetime is increased by more than an order of magnitude above its average value. Thus, it may be possible to generate spin waves in such composites decay especially slowly, and propagate especially large distances, for certain frequencies and directions in ${\bf k}$-space.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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