推迟模式下侧向Fe/Ni超晶格体极化子禁带宽度研究  

Study on forbidden bandwidth of bulk polaron in retarded modes of lateral Fe/Ni superlattice

作　　者：刘艳芬[1] 刘晓华[1] 孙为民[1] 刘晓军[1] 林方婷[2] 

机构地区：[1]齐齐哈尔大学理学院物理系,黑龙江齐齐哈尔161006 [2]上海师范大学物理系,上海200235

出　　处：《磁性材料及器件》2013年第5期15-18,53,共5页Journal of Magnetic Materials and Devices

基　　金：齐齐哈尔大学青年教师科研启动支持计划项目(2011k-M31);黑龙江省教育厅科学技术研究项目(11541398)

摘　　要：基于等效介质理论计算了半无限侧向Fe/Ni体系超晶格的体模式,通过对体极化子禁带宽度的讨论给出了自旋波在该体系下传播区域的改变。外场较小时磁性层的磁比例因子与外场对禁带宽度的影响规律性较强,Ni层越厚、外场越大禁带宽度越大。外场增大使趋肤效应与涡流损耗效应增强,导致自旋波衰减,禁带宽度变化情况复杂化。讨论结果与J.Barnas利用传输矩阵方法算出的磁性/非磁性超晶格推迟模式的体极化子的色散曲线很相似。对比发现,等效介质理论更具简便性,在所研究体系中第二种磁性介质的饱和磁化强度趋于0时即为J.Barnas的磁性/非磁性超晶格。Based on equivalent medium theory, body model of semi-infinite lateral Fe/Ni system superlattice was calculated. By discussion of forbidden band width of body polaron transmission area change of spin wave in the system is given. Under lower field the magnetic scale factor of magnetic layer and the field has stronger influence on the forbidden band width, or thicker Ni layer and higher applied field result in wider forbidden band width. Field increase enhance the skin effect and eddy current loss, leading to spin wave attenuation and complication of forbidden band width changes. The results is in accordance with the body polaron dispersion curve of the magnetic/nonmagnetic superlattice delay model given by J.Bamas using transfer matrix method. Compared to transfer matrix method, equivalent medium theory is more simple, and when saturation magnetization of the second magnetic media tends to zero, the system is as magnetic/nonmagnetic superlattices.

关 键 词：FE Ni体系超晶格 推迟模式 禁带宽度 体极化子 

分 类 号：O482.54[一般工业技术—材料科学与工程]