快速循环晶化Al/BiGaDyIG双层膜的研究结果表明,由于晶粒细化及膜层间干涉增强效应,在0.1～1.3 μm膜厚范围.其平均有效法拉第角比单层膜增加了0.25°,且随循环次数增加而增大。同时,部分Al3＋离子在退火期间扩散进石榴石的八面体和四面体位,导致居里温度下降(140～161 ℃)。这些结果对提高石榴石磁光盘信噪比以及增大记录密度是极有意义的。

The magneto-optical properties of a Al/BiGaDyIG double layer fine grain thinfilm crystalized with a rapid recurrent thermal annealing method has been investigated. Theeffective Faraday angle of the double layer film is over about 0. 25 degree than that of thecommon single layer film, and its Faraday angle inereases with the number of the rapidrecurrent annealing increased, which is due to the fineness of the grains and the interfaceinterference between the Al film and the garnet film. Meanwhile, the Al+3 ions diffuse into garnet film and substitute the Fe3+ ions in octahedral and tetrahedral sites, it results in a decrease of Curie temperature (140～161 ℃). These results are very promising for increasing the recording density and signal-noise-ratio.