铁磁共振下磁各向异性材料的负折射特性研究  

Negative Refraction Properties of Anisotropic Magnetic Materials at Ferromagnetic Resonance

作　　者：谢桂兵 耿滔[1] 王燕[2] 

机构地区：[1]上海理工大学理学院,上海200093 [2]江西师范大学物理与通信电子学院,南昌330022

出　　处：《上海理工大学学报》2013年第5期439-442,448,共5页Journal of University of Shanghai For Science and Technology

基　　金：国家自然科学基金资助项目(61008044);江西省青年科学基金资助项目(2011ZBAB215036)

摘　　要：利用Landau-Lifshitz-Gilbert模型理论计算了铁磁共振条件下天然材料锰钙钛矿薄膜的张量磁导率,发现铁磁共振能够获得负的磁导率,而锰钙钛矿材料特有的庞磁电阻效应可以得到负的介电常数,这使得负折射率成为可能.结合麦克斯韦方程组,分析了铁磁共振时材料的微波传播特性.研究结果表明,在外磁场下天然锰钙钛矿材料不仅可以获得负折射率,更重要的是负折射的工作频率受到了外磁场强弱的调制,材料具备了可调谐特性.In the presence of an external magnetic field,doped perovskite oxides materials exhibit their metallic property due to the colossal magnetoresistance（CMR）effect,which can provide a negative permittivity at GHz frequencies.These materials are also known as ferromagnetic materials,which can provide a negative permeability in a frequency region near the ferromagnetic resonance（FMR）.To date,there is no theoretical report on negative refraction properties of such anisotropic magnetic materials under ferromagnetic resonance conditions in detail.An analytic calculation of the initial complex permeability frequency spectra of thin film with in-plane anisotropy,using Landau-Lifshitz-Gilbert theory,was presented.

关 键 词：负折射 锰钙钛矿 铁磁共振 磁导率 

分 类 号：O441.6[理学—电磁学] O441.4[理学—物理]