Study on Preparation of High Quality Magneto-optical Oxide Films by Gel-Coating Technique

Bi-substituted rare-earth iron garnet (Bi：RlG) films been promised for ultra-high density magneto-optical (MO) storage media in the nextgeneration,because of a large MO-efficient in the blue wavelength区域in cooperation with realization of商业蓝光laser diodes. In connection with down-sized optotronic devicesfilm-type光学isolators have been requested. For this purpose，magnetophotonic crystals with Bi-RlG film is a promising candidate. a key technology for realizingthese is to synthesize high quality Bi：RlG films at low temperature，(1) Synthesis of high quality Bi: RlG films…开封府:RlG films could be fabricated by coating gels prepared by the "glycol gel process" andrf-sputtering. The fabrication conditions to obtain defect-free and optically flat Bi：RlG films with good magnetic properties were determined experimentally.(2) Low temperature synthesisof Bi: RlG films…Formation of Bi：RlG films on polycarbonate plastic plates is desirable to use MO-memory disks. Loweringcrystallization temperature of garnet is indispensable. Rapid annealing of pulse-like irradiation ofinfra-red light was found to be very useful to lower effective crystallization temperature ofgarnet to allow to use plastic substrates.这个方法也可以用来制造有用的东西magnetophotonic crystals by thermal annealing.(3) Combined with (1) and (2)，我们可以成功构造magnetopotonic crystals with a multi-layer system of（SiO - D22 - D2/SiO - D22 - D2） - D15 - D1Bi:YIG(SiO - D22 - D2O - D25 - D2/SiO - D22 - D2) - D15 - D1. The opticaland magneto-optical properties of the films coincided quantitatively with those evaluated by the films coincidedtheoretical analysis.(4) Construction of a film-type optical isolator operating at λ=1.3μm utilizingmagnetophonic crystals is now under way。

Bi-substituted rare-earth iron garnet (Bi : RlG) films have been promised for ultra-high density magneto-optical (MO) storage media in the next generation, because of a large MO-efficient in the blue wavelength region in cooperation with realization of commercial blue-light laser diodes. In connection with down-sized optotronic devices, film-type optical isolators have been requested. For this purpose, magnetophotonic crystals with Bi-RlG film is a promising candidate. A key technology for realizing these is to synthesize high quality Bi : RlG films at low temperature, which is the major theme of the investigation.(1) Synthesis of high quality Bi : RlG films………Bi : RlG films could be fabricated by coating gels prepared by the "glycol gel process" and rf-sputtering. The fabrication conditions to obtain defect-free and optically flat Bi : RlG films with good magnetic properties were determined experimentally.(2) Low temperature synthesis of Bi : RlG films………Formation of Bi : RlG films on polycarbonate plastic plates is desirable to use MO-memory disks. Lowering crystallization temperature of garnet is indispensable. Rapid annealing of pulse-like irradiation of infra-red light was found to be very useful to lower effective crystallization temperature of garnet to allow to use plastic substrates. This method was also found to be useful for fabrication of magnetophotonic crystals by thermal annealing.(3) Combined with (1) and (2), we could successfully construct magnetopotonic crystals with a multi-layer system of (SiOィイD22ィエD2/TaィイD22ィエD2)ィイD15ィエD1Bi:YIG(TaィイD22ィエD2OィイD25ィエD2/SiOィイD22ィエD2)ィイD15ィエD1. The optical and magneto-optical properties of the films coincided quantitatively with those evaluated by theoretical analysis.(4) Construction of a film-type optical isolator operating at λ=1.3μm utilizing magnetophonic crystals is now under way.