Nd:YIG磁和磁光性质理论研究  

A theoretical study of magnetic and magneto - optical properties of the Nd: YIG

作　　者：张芳[1] 徐游[2] 杨杰慧[1] 

机构地区：[1]洛阳师范学院物理系,河南洛阳471022 [2]南京大学物理系,江苏南京210008

出　　处：《东北师大学报（自然科学版）》2000年第2期39-43,共5页Journal of Northeast Normal University(Natural Science Edition)

基　　金：国家自然科学基金!(19674023);河南省自然科学基金!(984052000)

摘　　要：应用量子力学理论计算了Ｎｄ：ＹＩＧ中Ｎｄ３＋在０ Ｋ～３００ Ｋ热力学温度范围内的磁矩及它对Ｆａｒａｄａｙ偏转的贡献，结果表明 Ｎｄ：ＹＩＧ稀土次点阵的磁光效应主要来源于离子内４ｆ３→４ｆ２５ｄ电偶极跃迁，晶场和交换作用是决定磁矩和磁光效应的两个重要因素，在计算基组态的晶场劈裂时，必须考虑４Ｉ谱项的４个多重态间的混合，否则会引起较大误差．计算结果与实验符合良好．In the 0 K^300 K temperature range, the contributions of the Nd3+ ions in Nd: YIG on the magnetic moment and the Faraday rotation (FR) is calculated by using the quan- tum theory. The results show that the magneto - optical effects of the rare earth sublattice are mainly caused by the intra - ionic electric dipole transitions between the 4f3 and 4f25d configurations in the rare earth ions. The crystal field (CF) and the super - exchange inter- action are two crucial factors in the determination of the magnetic moment and the FR. In calculating the CF split level, all the four multiples of the ground term4I were included, oth- erwise a large error would be caused. The theoretical results are in good agreement with the experiments.

关 键 词：Faraday旋转 磁光性质 YIG磁 含钕石榴石 

分 类 号：O482.55[理学—固体物理]