Magnons and acoustic phonons in Y3-xBixFe5O12
Magnons and acoustic phonons in Y3-xBixFe5O12
复制标题
Y3-xBixFe5O12 中的磁振子和声学声子
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
Yu
中科院分区：
文献类型：
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作者：
G. Siu;C. M. Lee;Yu
利用布里渊光散射（Brillouin light scattering，BLS）技术研究了一系列掺Bi钇铁石榴石Y3-xBixFe 5 O 12（Bi-YIG）单晶的结构和性能，其中x = 0，0.14，0.36，0.54和0.92。BLS表明，最佳激光功率应尽可能低，小于或等于5 mW。BLS表明Bi-YIG的磁性和力学性能与Bi浓度有关。观察到两个体磁振子。一种是热激发磁振子模式，另一种是均匀静磁模式。热激发体磁振子的刚度常数D-ex、相对强度和带宽（半峰全宽）均随x线性增加，而4 μ M对掺杂不敏感。相反，散射强度和声子的声速降低。
We use Brillouin light scattering (BLS) to study a series of single-crystal Bi-doped yttrium iron garnet Y3-xBixFe5O12 (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, less than or equal to5 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 magnetostatic mode. The stiffness constant D-ex, the relative intensity and bandwidth (full width at half maximum) of the thermally excited bulk magnon all increase linearly with x, while 4 piM, is insensitive to doping. On the contrary, the scattering intensity and the sound velocity of the acoustic phonon decrease.