Coexistence of gyromagnetic resonance and low frequency plasmonic state in the submicron Ni granular composite materials
Coexistence of gyromagnetic resonance and low frequency plasmonic state in the submicron Ni granular composite materials
复制标题
DOI：
10.1063/1.4977997
复制
发表时间：
2017-03
影响因子：
3.2
通讯作者：
H. Massango;T. Tsutaoka;T. Kasagi;Shinichiro Yamamoto;K. Hatakeyama
中科院分区：
文献类型：
--
作者：
H. Massango;T. Tsutaoka;T. Kasagi;Shinichiro Yamamoto;K. Hatakeyama
为了研究亚微米镍颗粒复合材料的负介电常数和负介电常数谱，从射频到微波频段研究了其相对复磁导率和介电常数谱。Ni颗粒呈球形，平均直径为170 nm，致密颗粒的导电性为半导性。从电导率随颗粒含量的变化来看，镍复合材料在56.0Vol时表现为电渗流。%，其中电导率突然增加。在渗流阈值以上，观察到了高达65.7Vol的正介电常数谱。%；在颗粒含量为66.1Vol时，出现介电常数为负值的低频等离体态。%。在颗粒含量大于60Vol的样品中也观察到了由旋磁自旋共振引起的负磁导率谱。%。负介电常数与磁导率共存。
Relative complex permeability and permittivity spectra of submicron Ni granular composite materials have been studied from RF to microwave frequency range for realization of the negative permittivity and permeability spectra. The Ni particles are spherical in shape with the average diameter of 170 nm; the electrical conductivity of compacted particles shows a semiconductive property. From the variation of conductivity with particle content, it was found that the Ni composite material indicates an electrical percolation at 56.0 vol. % where the conductivity shows an abrupt increase. Above the percolation threshold, a positive permittivity spectrum with conductive loss was observed up to 65.7 vol. %; the low frequency plasmonic state with the negative permittivity spectrum was found at the particle content of 66.1 vol. %. A negative permeability spectrum caused by the gyromagnetic spin resonance was also observed in the particle content above 60 vol. %. The coexistence of negative permittivity and permeabil...