The Faraday Effect of Bismuth Substituted Rare-Earth Iron Garnet

概要

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Anomalous Faraday rotations of the following three series of polycrystalline garnets weremeasured; 1) Gd_3-xBi_xFe_50_12, 2) Gd_2Bi_1Fe_5-y,Ga_y,0_12 and Gd_2Bi_1Fe_5-yIn_y0_12, and 3) Y_2.25 Bi_0.75 Fe_5-y,Ga_y,0_12 and Y_2.25 Bi_0.75 Fe_5-y Sc_y 0_12. In series I and 2, the rotations were measured in the visible region at room tentperature. The rotation of series I increased linearly with x up to x=1.4, and the magneto-optical figure of merit reached 23 deg (at 0.56 μm) in Gd_2Bi_1Fe_5O_12. It was found in series 2 that the further substitution of Ga for Fe up to y=l.0 slightly decreased the figure of merit. In series 3, the rotations were measured in the near infrared region at a low temperature (8K) and the results were analyzed by using a one-ton model.It was found that two transitions near 3.1 eV and 2.8 eV, which are related to octahedral irons and tetrahedral irons respectively, were responsible for the anomalous rotation. These transitions were tentatively assigned to oxygen-iron charge-transfer transitions.
社団法人応用物理学会の論文
1975-12-05