FARADAY ROTATION IN BISMUTH SUBSTITUTED IRON GARNETS
FARADAY ROTATION IN BISMUTH SUBSTITUTED IRON GARNETS
复制标题
铋取代的铁石榴石中的法拉第旋转
DOI：
10.3379/jmsjmag.11.s1_235
复制
发表时间：
1987
影响因子：
--
通讯作者：
J. Desvignes
中科院分区：
文献类型：
--
作者：
H. Gall;M. Guillot;A. Marchand;Y. Nomi;M. Artinian;J. Desvignes
介绍了铋对铁磁石榴石磁光效应的贡献，并讨论了铋在可见光和近红外波段的应用，这两个波段分别对应于磁光器件的“垂直”和“平行”光学几何结构。在λ = 1150和633 nm处研究了法拉第旋转的温度和Bi含量的关系，确定了Bi对Fe ~（3+）离子在八面体和四面体晶位主要由电偶极跃迁引起的一级分子轨道系数的影响。的异常旋转的起源进行了研究，从光谱依赖的MO效应在0.5 - 3 eV的范围内进行。实验谱符合精确的公式，该公式考虑了一组顺磁和反磁跃迁的所有频率扩展。结果表明，在可见光和近红外波段，大部分的比旋光主要来源于中心位于2.79 eV的强顺磁跃迁。Bi-石榴石系统中的这些MO效应与主要由轻稀土如Nd、Pr和Ce引起的高法拉第旋转进行了比较。
The contribution of bismuth to the magnetooptical (MO) effects in ferromagnetic garnets is reviewed and discussed with respect to applications in the two visible and near infrared bands which correspond respectively to "perpendicular" and "parallel" optical geometries for MO devices. The temperature and Bi content dependences of the Faraday rotation are investigated at λ = 1150 and 633 nm and the influence of bismuth on the first order MO coefficients of Fe3+ ions mainly induced by electric dipole transitions are determined in the octa- and tetrahedral sites. The origin of the anomalous rotation is studied from the spectral dependence of the MO effect performed in the 0.5 - 3 eV range. The experimental spectra are fit for accurate formula which take into account all the frequency extension of a set of paramagnetic and diamagnetic transitions. It is shown that most of specific rotation in visible and near infrared originates mainly from a strong paramagnetic transition centered at 2.79 eV. These MO effects in Bi-garnet systems are compared to the high Faraday rotation induced mainly by light rare earth such as Nd, Pr, and Ce.