钇铁石榴石薄膜材料的光吸收谱及Bi、Al掺入对谱的影响研究

Effects of Bi and Al Substitution on Optical Absorption Spectrum of Yttrium Iron Garnet Film

采用单离子晶场跃迁模型，拟合出钇铁石榴石（ＹＩＧ）薄膜材料的光吸收谱，与实验谱吻合得较好。从实验和理论上分析了（ＢＩＡＩ）ＹＩＧ 薄膜材料的光吸收谱，结果表明，Ａｌ３＋离子的作用如同稀释剂一样，减小了光吸收，Ｂｉ３＋离子由于其强的自旋轨道耦合作用，增大了跃迁振子强度和跃迁线宽，从而增大了光吸收损耗，在此基础上所作的（ＢｉＡｌ）ＹＩＧ的理论谱与实验谱符合得较好。

By using the model of single-ion crystal field transitions, the optical absorption spectrum of Yttrium Iron Garnet film is obstained, it fits the experimental spectrum well. The experimental and theoretical analyses of the optical absorption spectra of (BiAl) YIG films show that, Al3+ ion acts as a dilution to decrease optical absorption, Bi3+ which has strong spin-orbit interaction, increase oscillator strength and transition linewidth, thus increase optical absorption losses. The theoretical absorption spectra of (BiAl) YIG film are in good agreement with the experimental.