[21p-P16-1~12] 3.15 Silicon photonics

▲ [21p-P16-5] Preparation and Characterization of Bi substituted gadolinium iron garnet (Bi_xGd_3-xFe₅O₁₂ films with x=1 to 2.5 by Enhanced Metal Organic Decomposition method

〇(D)AbdulWahid Danish¹, Jo Sato¹, Masashi Hosoda¹, Hiromasa Shimizu¹ (1.TUAT)

Keywords:EMOD,Faraday rotation,magnetic

Bismuth substituted gadolinium iron garnet thin films (Bi_xGd_3-xFe₅O₁₂) are prepared with x = 1, 2, and 2.5 on glass substrates by enhanced metal organic decomposition (EMOD) method. We mixed the liquids containing SYM-FE05 containing Fe₂O₃ carboxylates, SYM-BI05 containing Bi₂O₃ carboxylates, and SYM-GD01 containing Gd₂O₃ carboxylates by Kojundo Chemical Laboratory so that we could obtain desired Bi content. X-ray diffraction (XRD), optical transmittance / reflectivity, and Faraday rotation were measured for characterizations in order to examine their dependence on annealing temperatures and different amount of Bismuth substitution (x). When Bi_xGd_3-xFe₅O₁₂.thin films were directly prepared on glass substrates, Bi₂O₃ phase were observed by XRD measurements and with increasing Bi content x from 1 to 2, the Faraday rotation increased from 1.2 to 5.8 deg./μm at the wavelength of 530 nm. Faraday rotation of Bi_2.5Gd_0.5Fe₅O₁₂ thin films prepared directly on glass substrates were smaller (0.35 deg./μm) than that with x = 2. When Bi_2.5Gd_0.5Fe₅O₁₂ thin films were prepared with annealing temperature of 650 ^oC with Gd₃Fe₅O₁₂ buffer layer on glass substrates, the films showed Faraday rotation, which is comparable with that of Bi_2.5Gd_0.5Fe₅O₁₂ thin films prepared on (111) SGGG substrates. Our experimental results show that Bi_xGd_3-xFe₅O₁₂ thin films can be prepared on glass substrates with controlled Bi content, and Faraday rotation as high as that prepared on SGGG substrate can be obtained by EMOD method.