SIZE-DEPENDENT SPIN-WAVE FREQUENCY IN FERROMAGNETIC WIRE-ARRAY STRUCTURES
SIZE-DEPENDENT SPIN-WAVE FREQUENCY IN FERROMAGNETIC WIRE-ARRAY STRUCTURES
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铁磁线阵列结构中与尺寸相关的自旋波频率
DOI：
10.1103/physrevb.58.345
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发表时间：
1998
影响因子：
3.7
通讯作者：
D. Hasko
中科院分区：
文献类型：
--
作者：
A. Ercole;A. Adeyeye;J. Bland;D. Hasko
报道了通过布里渊光散射 (BLS) 测量铁磁 FeNi 线阵列结构中的自旋波频率。研究的阵列厚 600 埃，线宽在 0.8 至 10 μm 之间，线之间的间距是宽度的两倍。自旋波频率是在 Voigt 几何结构中通过平行或垂直于导线施加的外部场来测量的。随着结构尺寸的减小，BLS 强度迅速下降。对于垂直场几何结构，我们观察到表面和第一体积模式频率均下降。我们证明这是由于静态消磁场造成的。平行场情况显示，随着导线尺寸的减小，仅表面模式的频率上升，我们证明这是振荡磁边缘电荷的影响。
Spin-wave frequency measurements in ferromagnetic FeNi wire-array structures by Brillouin light scattering (BLS) are reported. The arrays studied were 600 Å thick and had wire widths of between 0.8 and 10 μm, with separations between wires of twice the width. The spin-wave frequencies were measured in the Voigt geometry with an external field applied parallel or perpendicular to the wires. A rapid drop in BLS intensity with decreasing structure size was seen. For the perpendicular field geometry, we observed a decrease in both the surface and first volume-mode frequencies. We show this to be due to static demagnetizing fields. The parallel field case showed a rise in frequency of only the surface mode with decreasing wire size, which we demonstrate to be the effects of oscillating magnetic edge charges.