Evolution of the optical and magnetooptical properties of amorphous metal-insulator nanocomposites
Evolution of the optical and magnetooptical properties of amorphous metal-insulator nanocomposites
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DOI：
10.1134/1.1767571
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发表时间：
2004-01-01
影响因子：
1.1
通讯作者：
Kim, CG
中科院分区：
文献类型：
--
作者：
Gan'shina, EA;Vashuk, MV;Kim, CG
研究了非晶态铁磁金属-绝缘体型颗粒复合材料（Co 45 Fe 45 Zr 10）（x）（SiO2）（100 - x）和（Co 41 Fe 39 B20）（x）（SiO2）（100 - x）在较宽磁性组分浓度x范围内的磁性、光学和磁光（MO）性质。纳米复合材料的MO响应在逾渗转变附近增加。利用实验测得的光学常数和赤道克尔效应，首次计算了纳米复合材料的介电常数张量的对角分量和非对角分量。该张量的非对角分量是x的非线性函数，在渗流阈值附近观察到最明显的变化。在有效介质近似和Maxwell-Garnett近似的框架内，对MO效应和介电常数张量的实验数据进行了理论建模。最充分的描述与对称的麦克斯韦-加内特近似，它提供了一个很好的（半定量）协议的理论和实验之间的某些假设下的纳米复合材料的微观结构。(C)2004年MAIK“Nauka/Intertina”。
Magnetic, optical, and magnetooptical (MO) properties of (Co45Fe45Zr10)(x)(SiO2)(100 - x) and (Co41Fe39B20)(x)(SiO2)(100 - x) granular nanocomposites of the amorphous ferromagnetic metal-insulator type were studied in a broad range of the magnetic component concentrations x. The MO response of nanocomposites increases in the vicinity of the percolation transition. Using the experimentally determined values of optical constants and the equatorial Kerr effect, the diagonal and nondiagonal components of the permittivity tensor of nanocomposites were calculated for the first time. The nondiagonal components of this tensor are nonlinear functions of x, the most pronounced variations being observed near the percolation threshold. Experimental data on the MO effect and the permittivity tensor were theoretically modeled within the framework of the effective medium approximation and the Maxwell-Garnett approximation. The most adequate description was obtained with the symmetrized Maxwell-Garnett approximation, which provides for a good (semiquantitative) agreement between theory and experiment under certain assumptions about the microstructure of nanocomposites. (C) 2004 MAIK "Nauka/Interperiodica".