磁泡石榴石外延膜磁参数漂移的起因和抑制方法

本文研究了磁泡石榴石外延膜磁参数漂移的起因和抑制方法。我们认为石榴石外延膜磁参数漂移的主要起因是过饱和熔体的非自发成核和长大,并利用熔体营养料的有效浓度R_eff=R₄-R_n-R_e予以解释。外延过程熔体营养料浓度的消耗是R_n+R_e,而且R_n比R_e对石榴石外延膜磁参数的影响大得多。在回温控制过程中R_n=0,其熔体是相对稳定的。衬底的搅拌可加速熔体的非自发成核和长大。关键词：

CAUSES AND CONTROL METHODS OF MAGNETIC PARAMETER DRIFTS FOR MAGNETIC BUBBLE LPE GARNET FILMS

The causes and control methods of the magnetic parameter drifts for magnetic bubble LPB garnet films are investigated. It is considered that the main cause of the magnetic parameter drifts is the garnet heterogeneous nucleation and growth of the supersaturated melt. The phenomenon of melt compositional drift is explained in terms of the effective concentration of melt nutrient R_eff = R₄-R_n-R_e, where R₄ is the original concentration of the nutrient, R_n is the nutrient concentration consumed by the heterogeneous nucleation and growth, and R_e is the nutrient concentration consumed by the LPE films. The eonsumption of melt nutrient concontration in LPE process is equal to R_n+R_e, and the effect of R_n on the magnetic parameters of LPE garnet films is much greater than R_e. In the reheating control process R_n= 0, and the melt is relatively stable. Stirring of substrates may accelerate the heterogeneous nucleation and growth of the melt.