【摘要】 在二维正方绝缘铁磁系统基础上建立了一个磁振子-声子相互作用模型·利用格林函数方法研究了磁振子-声子相互作用下的二维绝缘铁磁体的磁振子谱,计算了布里渊区的主要对称点线上的磁振子色散曲线·发现在布里渊区边界区域磁振子谱的软化和磁振子谱线增宽最明显·比较了纵向声子与横向声子对磁振子谱的软化与磁振子谱线增宽的影响,也讨论了各项参数的变化对磁振子谱的软化与磁振子谱线增宽的影响·更多还原

【Abstract】 A magnon-phonon interaction model is developed in two-dimensional insulating ferromagnet of which the magonon spectrum is studied in accordance to Matsubara-Green function. The magnon dispersion curve is calculated on the main symmetric points lines in Brillouin zone for different parameters in the system. It is found that at the boundary of the zone the magnon linewidth broadens and magnon softens both most obviously. The influences of longitudinal phonon and transverse phonon on magnon softening and magnon linewidth broadening are compared, and the influences of different parameters on them are also illustrated.更多还原