摘要
重点讨论了在不同的层间耦合下外磁场和横向自旋波结构因子对色散关系的影响.结果表明:外磁场和横向自旋波结构因子都能使能带分裂,出现能隙.且随着它们的增强各类本征模之间相互转化,能量呈线性增加.层间铁磁性耦合时,只能存在光学-声学型界面自旋波;层间反铁磁性耦合时,可能存在声学-光学型和光学-光学型两类界面自旋波.
The dispersion relations of spin waves in a ferromagnetic and antiferromagnetic materials bilayer system are investigated by taking the effect of the magnetic field and spin waves structure factor into account.It is shown that the magnetic filed and the factor can divide the energy bands to form energy gap.And with their intensity increasing,all kinds of modes can mutually transform.Furthermore,the energy of all kinds of eigenmodes depends linearly on the magnetic fields.In addition,there only exists optical-acoustical interface mode for interlayer ferromagnetic coupling;for interlayer antiferromagnetic coupling,however,there may exist acoustical-optical mode and optical-optical mode.
出处
《内蒙古大学学报（自然科学版）》
CAS
CSCD
北大核心
2005年第3期259-263,共5页
Journal of Inner Mongolia University：Natural Science Edition
基金
国家自然科学基金(No.10147203)
内蒙古教育厅基金(No.NJ02004)资助项目
关键词
铁磁-反铁磁薄膜
色散关系
自旋波
ferromagnetic/antiferromagnetic film
dispersion relations
spin waves
