Fe/In_2O_3磁性颗粒膜的光学特性  

OPTICAL PROPERTIES OF Fe/In_2O_3 MAGNETIC GRANULAR FILMS

作　　者：张汝贞[1] 张连生[1] 张林[1] 黄宝歆 刘宜华[1] 张维 梅良模[1] 

机构地区：[1]山东大学物理系,济南250100

出　　处：《功能材料与器件学报》1999年第1期8-12,共5页Journal of Functional Materials and Devices

基　　金：国家自然科学基金

摘　　要：研究了射频溅射法制备的磁性颗粒膜的光学特性．发现在In2O3母体材料中嵌入Fe颗粒的磁性颗粒膜中，电子的带间跃迁由In2O3的直接跃迂变为间接跃迁，基本吸收边变平；随磁性粒子所占体积分数的增加，局域态尾变宽，带隙变窄．这是由于嵌入Fe颗粒后，母体材料与磁性颗粒的界面处表面积增加，具有了较多的表面态，以及母体材料的非晶化引起的。Optical properties of Fe/InO3 magnetic granular films (MGF) prepared by using rf-sputtering system were presented. In2O3 is a kind of semiconductor material with direct transition band gap, but the transition between bands for Fe/In2O3 MGF is indirect. Comparing with the absorption edge of In2O3, the absorption edge of Fe/In2O3 becomes less steep, the band gaps of MGF decrease monotonously with the increase of volume fraction of Fe grains in the MGF films, and the tail width of localized states becomes wider in concentration range of Fe studied. The decrease of Eopt with concentration of Fe, can be attributed to (1) the non-crystallization of the In2O3 mains with the increase of concentration of Fe; (2) the increase of surface states, owing to the increase of the surfaCe area at the interface between magnetic grains and the matrix.

关 键 词：磁性颗粒膜 间接跃迁 局域态 光学特性 

分 类 号：O484.41[理学—固体物理]