磁性颗粒膜法拉第转角的研究  

Research of Magnetic Granular Film Faraday Rotation Angle

作　　者：郑勇林[1] 郑瑞伦[2] 

机构地区：[1]涪陵师范学院物理系,重庆408003 [2]西南师范大学物理学院,重庆400715

出　　处：《光学学报》2005年第8期1126-1130,共5页Acta Optica Sinica

基　　金：重庆涪陵师范学院院级重点学科建设基金(2003148);重庆市科委项目(20027310)资助课题。

摘　　要：在外磁场作用下,复合介质的法拉第磁光效应依赖于颗粒膜电介质张量。而复合介质的电介质张量的计算相当复杂。运用了有效介质近似理论,利用非均匀复合介质的有效电场等于单个颗粒中局域场的平均值的自恰条件,由电介质张量eε方程及自洽条件导出了计算磁性颗粒膜系统磁光法拉第转角的解析公式。并应用导出的关系,以Cu金属颗粒为例,讨论了颗粒膜中金属颗粒含量及对应的基质、离子浓度、颗粒形状对法拉第转角的影响,结果表明,利用有效介质近似理论计算的结果与实验结果一致。Under an applied magnetic field, the Faraday magnetic-optical effect of composite media is dependent on the calculation of dielectric tensor. It is rather complicated to evaluate the dielectric tensor of composite media.Using the inhomogeneous composite effective electric field equal to the average electric field the effective-medium approximation equations of the inhomogeneous composite are derived. By use of dielectric tensor εe equation and selfconsistency condition, the grain films systematic formula of magnetic-optical Faraday rotation angle is calculated.Corresponding matrix, ion concentration and the shape of metallic granular in grain films with Cu as example, the influence for magnetic granular films Faraday rotation angle is discussed. The effective medium approximate calculation is consistent with experimental result.

关 键 词：磁性颗粒膜 磁光效应 法拉第转角 有效介质近似 

分 类 号：O435[机械工程—光学工程]