布里渊散射深入研究Y3-xBixFe5O12晶体中的磁振子和声学声子

刘玉龙; 萧季驹

光散射学报, 2002, 14 (1): 13, 网络出版: 2006-05-19

布里渊散射深入研究Y_3-xBi_xFe₅O₁₂晶体中的磁振子和声学声子

Advanced Study on Magnons and Acoustic Phonons in Y_3-xBi_xFe₅O₁₂ by Means of Brillouin Scattering

论文大纲

刘玉龙 ¹萧季驹 ²

作者单位

¹ 中国科学院物理研究所光物理开放实验室,北京,100080

² 香港城市大学,物理及材料科学系,香港,九龙

布里渊散射磁振子声学声子 Brillouin light scattering magnons acoustic phonons

摘要

我们选用x=0,0.14,0.36,0.54,和0.92的Y_3-xBi_xFe₅O₁₂系列单晶,开展了比早期实验更为深入的布里渊散射研究.实验发现对于Bi-YIG晶体,照射在样品上小于5 mW的激光功率为最佳激发功率.布里渊散射结果表明Y_3-xBi_xFe₅O₁₂晶体中的磁性能和机械性质与Bi含量密切有关.此实验观测到了两种体波性质的磁振子,一个是热激发的自旋波,另一个被确认为静磁模.实验还发现声学声子的散射强度和声速随Bi含量的增加而减少.

Abstract

We use Brillouin light scattering (BLS) to study a series of single-crystal Bi-dopedyttrium iron garnet Y_3-xBi_xFe₅O₁₂ (Bi-YIG) prepared with x = 0,0.14,0.36,0.54 and 0.92.BLS shows that the optimal laser power should be as low as possible, ≤5 mW. BLS manifests the Bi-concentration dependence of the magnetic and mechanic properties of Bi-YIG. Two bulk magnons are observed. One is the thermally excited magnon and another is the uniform magne-tostatic mode. The scattering intensity and the sound velocity of the acoustic phonon decrease with x.

参考文献

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刘玉龙, 萧季驹. 布里渊散射深入研究Y_3-xBi_xFe₅O₁₂晶体中的磁振子和声学声子[J]. 光散射学报, 2002, 14(1): 13. 刘玉龙, 萧季驹. Advanced Study on Magnons and Acoustic Phonons in Y_3-xBi_xFe₅O₁₂ by Means of Brillouin Scattering[J]. The Journal of Light Scattering, 2002, 14(1): 13.

布里渊散射深入研究Y_3-xBi_xFe₅O₁₂晶体中的磁振子和声学声子

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