纳米磁性液体薄膜磁光特性研究  

Magneto-optical properties of nanopartical magnetic fluid film

作　　者：徐丽琴[1,2] 方文啸[1] 马颖[1,2] 张曰理[1] 

机构地区：[1]中山大学理工学院,光电材料与技术国家重点实验室,广东广州510275 [2]广州大学物理与电子工程学院,广东广州510006

出　　处：《功能材料》2007年第A03期1176-1178,共3页Journal of Functional Materials

基　　金：广东省科技计划资助项目（2004860303001,2006A1100100）.

摘　　要：制备出了纳米磁性液体薄膜，研究了纳米磁性液体薄膜在不同外加磁场（垂直和平行）下，其透射光学特性随着磁场变化的规律，对纳米磁性液体薄膜磁光现象产生的原因进行了解释。研究发现：（1）薄膜外加垂直磁场时，光透射强度随着磁场强度的增加而减小；（2）薄膜外加平行磁场时，垂直偏振光和平行偏振光的透射强度随着磁场强度的增加而变化规律不同；（3）存在一个临界磁场，其值约为4776A/m，当外加磁场（垂直和平行）强度＞4776A/m后，薄膜透射光强的变化规律有明显不同，这种现象是由于外加磁场使纳米磁性液体微粒产生聚集，磁场〉4776A/m后，形成有规则的排列结构所造成；（4）纳米磁性液体外加垂直磁场下透射强度的响应时间随磁场强度的变化情况。The thesis fabricate the nanoparticle magnetic fluid film, we study the changing rules of the nanoparticle magnetic fluid film transmission optical properties under parallel or perpendicular external magnetic fields, we explain the magneto-optical phenomena of nanoparticle magnetic fluid film. The results involved in this thesis as follows; （1） The transmission intensity of the film under perpendicular magnetic field decreases with increase of the magnetic field. （2）The changing rule of the vertical-polarized light transmission intensity is different from the parallel-polarized light transmission intensity with the increase of the magnetic field; （3） There is a critical magnetic field, which is about 4776A/m. When magnetic field is more than 4776A/m, the changing rules of transmission intensity is obviously different. It is because that, the nanoparticle in the film agglomerate and form magnetic columns, these columns evolve from a disordered column phase to an ordered structural pattern as the field strength reaches a critical value 4776A/m; （4） We also study the response time of the transmission intensity with the changing of magnetic field.

关 键 词：纳米磁性液体 磁光效应 透射强度 

分 类 号：O482.55[理学—固体物理]