ABSTRACT A left-handed metamaterial (a YIG/Ag composite with adjustable negative permittivity and permeability) was prepared by an in situ synthesis process, and its characterisation, microstructure, electrical conductivity, dielectric loss and magnetic properties studied. A negative permittivity behaviour with a Fano-like resonance is ascribed to plasma oscillation of delocalised electrons from silver conducting networks. As the silver content increases, the turbine loss increases, which greatly enhances the electromagnetic wave consumption capacity inside the material and leads to a stronger electromagnetic absorption and shielding performance. The dielectric loss near the percolation threshold is due to the combined effects of polarisation and conduction. The capacitive character is responsible for positive permittivity, and the inductive character leads to negative permittivity. LC resonance results in the Fano-like resonance, leading to the permittivity changing from negative to positive. Gyromagnetic spin rotation, domain wall motion and percolation characteristic of YIG/Ag composites cause frequency dispersion of the permeability. The YIG/Ag composite with double negative characteristics provides prospects for electromagnetic shielding application.

中文翻译：

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左手超材料复合材料的制备及性能

摘要 采用原位合成法制备了左手超材料（一种具有可调负介电常数和磁导率的 YIG/Ag 复合材料），并研究了其表征、微观结构、电导率、介电损耗和磁性能。具有类 Fano 共振的负介电常数行为归因于来自银导电网络的离域电子的等离子体振荡。随着银含量的增加，涡轮损耗增加，大大增强了材料内部的电磁波消耗能力，导致更强的电磁吸收和屏蔽性能。渗透阈值附近的介电损耗是由于极化和传导的综合影响。电容特性负责正介电常数，并且电感特性导致负介电常数。LC 共振导致类 Fano 共振，导致介电常数从负变为正。YIG/Ag 复合材料的旋磁自旋旋转、畴壁运动和渗透特性导致磁导率的频率色散。具有双负特性的YIG/Ag复合材料为电磁屏蔽应用提供了前景。