NixSiO2(1-x)颗粒膜的光学和磁光特性研究

摘要

A series of N ixSiO2(1-x) granular films were made by a magnetron rf sputterin g system with variation of x and the annealing process. Both the complex di electric function and magneto-optical polar Kerr spectra of the samples were me asured at room temperature in the 1.5～4.5eV photon energy range, respectively. I t was found that there are new spectral features in the dielectric functions. Th e ε1 spectra change continuously from positive to negative at the low pho ton energy range in these metal-insulator granular films by adjusing the compos ition or by the annealing process. For the NixSiO2(1-x) samples, there are broad peaks in the Kerr rotation and ellipticity spectra. The Kerr in tensities increase with increasing Ni composition. Both the off-diagonal terms of the dielectric terms tensor and optical constants play important role in th e enhancement of the Kerr effect in a particular spectral range for the metal-i nsulator granular films.%用磁控溅射法制备了一系列NixSiO2(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 ～4.5eV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.