贵金属Ag中光学和磁光性质的实验研究

EXPERIMENTAL STUDY OF OPTICAL AND MAGNETIC-OPTIC PROPERTIES OF NOBLE METAL Ag

用椭圆偏振光谱仪和磁光谱仪研究了热蒸发和溅射法制备的Ag膜的光学和磁光性质 .在 1 0T的外磁场作用下 ,贵金属Ag在 3 9eV附近具有可观的磁光效应 .分析发现主要来源于两个方面 :1)自由电子在外磁场中回旋共振引起小的非对角元 ;2 )Ag本身在 3 9eV附近的光学性质 .数值计算表明磁光克尔效应θK 和εK 的峰值随ωc 的增加而增大 .对磁光实验数据拟合的有效质量与光学的相应数值基本相符 ,这为自由电子有效质量的测量提供了一种新方法 .

The magneto-optic and optical properties of evaporated and sputtered Ag were studied experimentally and theoretically. An apparent Kerr effect near 3.9 eV was observed at room temperature. It was found to originate from the small off-diagonal term of dielectric function tensor,induced by the free electron movement under an applied magnetic field. The special optical properties near 3.9 eV due to the strong plasma absorption affect the line shape of the spectrum. The simulations,based on the classic Drude model,show the effective electron mass m* = 0.8m(0). This provides a new method to experimentally determine the effective electron mass and other parameters.