【摘要】 用磁控溅射法制备了一系列 Nix Si O2 (1 - x) 样品 ,并对部分样品作快速退火处理 ,室温下采用椭圆偏振光谱仪和磁光谱仪分别在 1.5～ 4.5 e V的光子能量区测量了样品的复介电常数谱和极向复磁光克尔谱 ,研究了这种金属 -绝缘体型颗粒膜的光学和磁光性质 .发现调整合适的金属含量或对样品作退火处理 ,可以观察到复介电常数的实部从正到负的连续变化 ,而且在一定光子能量区 ,其值为零 ;介电张量的非对角元和光学常数对其磁光克尔角的增强起重要作用更多还原

【Abstract】 A series of Ni x SiO 2(1- x ) granular films were made by a magnetron rf sputtering system with variation of x and the annealing process. Both the complex dielectric function and magneto optical polar Kerr spectra of the samples were measured at room temperature in the 1.5~4.5eV photon energy range, respectively. It was found that there are new spectral features in the dielectric functions. The ε 1 spectra change continuously from positive to negative at the low photon energy range in these metal insulator granular films by adjusing the composition or by the annealing process. For the Ni x SiO 2(1- x ) samples, there are broad peaks in the Kerr rotation and ellipticity spectra. The Kerr intensities increase with increasing Ni composition. Both the off diagonal terms of the dielectric terms tensor and optical constants play important role in the enhancement of the Kerr effect in a particular spectral range for the metal insulator granular films.更多还原