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用布里渊散射技术测量了BCVIG(Bi3-2xCa2xFe5-xVxO12)单晶的磁振子散射谱,同Sande-rcock,Wettling对YIG以及刘玉龙等人对Bi-YIG单晶的测量相比,我们得到了除主峰之外的连续谱带。按照偶极-交换自旋波理论讨论了测到的自旋波谱。测量还表明BCVIG单晶的自旋波劲度系数D比YIG和Bi-YIG单晶大得多,讨论了D增大的原因,研究了D与入射激光功率的关系。Magnon spectra were measured by means of Brillouin scattering from single crystals BCVIG (Bi3-2xCa2xFe5-xVxO12). We obtained a continuous band, including the bulk mag-non peak, which has been observed by Sandercock et al. in YIG, and Liu and Zhang et al. in Bi-YIG. The measured dispersion relation of the magnon band was analysed based on the theory of dipole-exchange spin waves. This measurement also show that the spin wave stiffness constant D is much larger than that of YIG and Bi-YIG. The reason of the lager D is discussed and its dependence on the incident laser power was studied.
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