Brillouin light scattering study of magnon branch crossover in thin iron films
Brillouin light scattering study of magnon branch crossover in thin iron films
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薄铁膜中磁振子分支交叉的布里渊光散射研究
DOI：
10.1103/physrevb.29.6396
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发表时间：
1984
影响因子：
3.7
通讯作者：
P. Grünberg
中科院分区：
文献类型：
--
作者：
P. Kabos;W. Wilber;C. Patton;P. Grünberg
用布里渊光散射测量了铁薄膜中磁振子色散支路的表面和交换分支的频率与波数的关系。对于所研究的最厚的薄膜(750ä)，可以区分多个交换分支和表面模式。对于较薄的348°薄膜，单交换支路和表面支路之间的支路交叉和排斥问题得到了特别好的解决。实验测得的色散支路和支路斥力与理论符合得很好。对于所研究的最薄的薄膜，观察到了与薄膜两侧相关的表面磁子，并测量了两个峰的强度比与波数的关系。结果与简单的侵彻深度考虑是一致的。
Brillouin light scattering has been used to measure frequency versus wave number for the surface and exchange branches of the magnon dispersion manifold in thin iron films. For the thickest film studied (750 Å), multiple-exchange branches and the surface mode could be distinguished. For a thinner 348-Å film, the branch crossing and repulsion between the single-exchange branch and the surface branch were particularly well resolved. The measured dispersion branches and branch repulsion are in good agreement with the theory. For the thinnest film studied, 232 Å, the surface magnons associated with both sides of the film were observed, and the intensity ratio for the two peaks was measured versus wave number. The results are consistent with simple penetration depth considerations.