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arXiv 0804.0734cond-mat.mtrl-scicond-mat.other
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畴壁对Ni81Fe19条带热自旋波谱的修正

Modification of the thermal spin-wave spectrum in a Ni81Fe19 stripe by a domain wall

C. W. Sandweg, S. J. Hermsdoerfer, H. Schultheiss, S. Schaefer, B. Leven, B. Hillebrands

摘要:

利用布里渊光散射显微镜研究了具有非对称横畴壁的Ni_(81)Fe_(19)条中的热自旋波分布。结果表明,畴壁的存在影响了热模的自旋波分布。热自旋波模由于径向的限制而量子化。它们在畴壁附近消失,在这种复杂的畴壁结构中演化出一种新的模。这种效应归因于畴壁区有效内场的变化。实验结果与静态和动态微磁学模拟结果吻合较好。

英文摘要:

The thermal spin-wave distribution in a Ni81Fe19 stripe with an asymmetric transverse domain wall has been investigated using Brillouin light scattering microscopy. Clear evidence has been found that the existence of the domain wall influences the spin-wave distribution of the thermal modes. The thermal spin-wave modes are quantized due to the confinement in radial direction. They vanish near the domain wall and a new mode evolves inside this complex domain wall structure. This effect is attributed to a change of the effective internal field in the domain wall region. The experimental results agree well with static and dynamic micromagnetic simulations.

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