| 铁磁线阵的负折射频率区域 |
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| 引用本文： | 徐秋燕,夏青. 铁磁线阵的负折射频率区域[J]. 首都师范大学学报(自然科学版), 2007, 28(3): 33-38,43 |
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| 作者姓名： | 徐秋燕 夏青 |
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| 作者单位： | 首都师范大学物理系,北京,100037;西安机电信息技术研究所,西安,710065 |
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| 基金项目： | 国家重点基础研究发展计划(973计划);北京市教委科研项目 |
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| 摘 要： | 从理论上研究了外磁场中的二维正方格子铁磁线阵（FWL）模型的负折射性质,计算中选用的铁磁材料分别为铁（Fe）,钴（Co）,镍（Ni）和钆（Gd）.计算了这些FWL系统的几何参数对于其负折射频率范围的影响以及负折射率随着外磁场变化的规律.发现提高负介电常数频率比较容易实现,而提高负磁导率频率则比较困难.这是因为负磁导率频率主要受饱和磁化强度的限制.所以高饱和磁化强度是提高负折射频率的关键.
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| 关 键 词： | 负折射材料 铁磁性金属线阵 有效磁导率 有效介电常数 |
| 修稿时间： | 2007-01-13 |
Frequency Regions of the Negative Refractive Index Materials Composed of Ferromagnetic Wire Lattice |
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| Xu Qiuyan,Xia Qing. Frequency Regions of the Negative Refractive Index Materials Composed of Ferromagnetic Wire Lattice[J]. Journal of Capital Normal University(Natural Science Edition), 2007, 28(3): 33-38,43 |
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| Authors: | Xu Qiuyan Xia Qing |
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| Abstract: | The negative refractive indexes of ferromagnetic wire lattice(FWL) composed of ferromagnetic wires made of Fe,Co,Ni,and Gd,respectively,arrangedinatwo-dimensional squarelattice under external magneticfield areinvestigatedtheoretically.The frequencyregions of negative refractive indexes influenced bythe geometry parameters are studied andthe negative refractive indexes varying withthe external magnetic field are calculated.We found it is easier to increasethefrequencyregion of negative dielectric constant than increasing that of negative permeability.The frequency of thenegative permeabilityis limited bythe saturation magnetization of theferromagnetic material,sothe keyfactorfor a FWLto increasethefrequencyof negative refractiveindexisthe saturation magnetismof the material that constitutesthe FWL. |
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| Keywords: | negative refraction material ferromagnetic wire lattice(FWL) effective permeability effectivepermittivity. |
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