二维铁磁反点晶格在有效条纹极限下的共振模式动力学

R. Zivieri
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引用次数: 0

摘要

在有效条纹极限下,从理论上研究了二维坡莫合金反点阵在纳米范围内的共振模式动力学。分析是根据有限差分微磁法、动力矩阵法和解析计算的方法进行的。沿着y轴施加的外部磁场使静态磁化沿同一方向对齐,从而在孔的边界上诱导形成“表面磁荷”。在有效条纹极限内由不连续的有效“表面磁荷”分布过渡到连续的有效“表面磁荷”分布对系统谐振模式的动力学特性有很大的影响。由于大的退磁场,通过解析计算表明,有效一维条纹的共振模式不能存在于给定的宽高比以上。从二维磁振子超材料到一维磁振子超材料,共振模式的动力学特性发生了显著变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Resonant mode dynamics of two-dimensional ferromagnetic antidot lattices in the effective stripe limit
The resonant mode dynamics of two-dimensional permalloy antidot lattices in the nanometric range is studied theoretically in the effective stripe limit. The analysis is performed both according to a finite-difference micromagnetic approach, the dynamical matrix method, and by means of analytical calculations. The external magnetic field applied along the y-axis aligns the static magnetization along the same direction which induces the formation of “surface magnetic charges” on the border of the holes. The passage from a discontinuous to a continuous effective “surface magnetic charges” distribution in the effective stripe limit has a strong influence on the dynamics of the resonant mode of the system. Due to the large demagnetizing field it is shown via analytical calculations that the resonant mode of the effective one-dimensional stripe cannot exist above a given aspect ratio. The dynamical properties of the resonant mode dramatically change passing from a two-dimensional to a one-dimensional magnonic metamaterial.
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