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The effect of cell size in calculating frequencies of magnetic modes using micromagnetics: The special role of the uniform mode

机译:单元尺寸在使用微磁学计算电磁模频率中的影响:均匀模的特殊作用

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摘要

Using the time evolution of the dynamic magnetization, we study the frequencies of spin excitations in small ferromagnetic bars with particular attention to the uniform mode. The calculation is done using micromagnetics, and the frequency of various modes is found as a function of the cell size used in the calculation. We find that the uniform mode and some standing spin-wave modes are relatively insensitive to changes in the cell size. In contrast, edge modes and corner modes show significant frequency changes as the cell size is changed in the micromagnetics calculation. These results justify the use of micromagnetics with larger cells to estimate the frequency of the uniform mode of micronsized magnetic bars. A comparison of experiment and theory shows that the micromagnetics estimate is significantly better than the usual Kittel formula with effective demagnetizing factors; however appreciable differences remain.
机译:利用动态磁化的时间演化,我们研究了小型铁磁条中的自旋激发频率,尤其要注意均匀模式。使用微磁进行计算,并且发现各种模式的频率是计算中所用像元大小的函数。我们发现,均匀模式和某些驻波模式对单元尺寸的变化相对不敏感。相反,在微磁学计算中,随着晶胞大小的变化,边缘模式和角模式显示出明显的频率变化。这些结果证明使用具有较大单元的微磁性来估计微米级磁条的均匀模式的频率是合理的。实验和理论的比较表明,具有有效退磁因子的微磁估计值明显优于通常的Kittel公式。但是仍然存在明显差异。

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