KJ Ceramics 31

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Detailed Program

Paper Number : EL-I04

Time Frame : 10:45~11:10

Presentation Date : Friday, 28, November

Session Name : Electronic Ceramics

Session Chair 1# : Jong-Sook Lee

Session Chair 2# : Nobuyasu Adachi

Preparation of Bismuth Gallium Iron Garnet on glass substrate by MOD technique

Nobuyasu ADACHI

Nagoya Institute of Technology

Keywords: Magnetic garnet, MO effect, glass substrate, MOD technique

In order to prepare the magneto-optical (MO) devices on glass substrate, the Bi3Fe5-xGaxO12 (BIGG) films were prepared on glass substrate by metal organic decomposition (MOD) technique. The MO device on glass substrate has a great advantage for the commercial use of magnetic imaging sensor, waveguide devices with magneto-static waves (MSW) and MO effect and integrated MSW-MO devices. Originally, the Bi3Fe5O12 (BIG) or BIGG cannot be grown on glass but for single crystal garnet substrate. In order to crystallize on glass substrate, the buffer layers with garnet structure were inserted. For the buffer layer, several composition ratios such as Bi1Y2Fe5O12, Bi1Nd2Fe5O12 and Nd1Y2Fe5O12 were compared each other. The buffer layers were crystallized with garnet structures on glass substrate only by annealing process more than 650 degree C. The metal organic solutions for the BIG and the BIGG were spin-coated on the buffer layer, then dried at 100 degree C and pre-annealed at 400 degree C. These processes were repeated 10 times. Finally, the BIG and BIGG films were crystallized by annealing at 480 degree C. The Faraday rotations of the BIG films with 10 times coating showed the largest values for the case of Nd1Y2Fe5O12 buffer layer and this value is almost the same as the film on GGG substrate. The lattice parameter of Bi1Nd2Fe5O12 is the most close to the BIG, however the island grain structure was observed for the buffer layer surface. For the case of the Nd1Y2Fe5O12, the surface structure was smooth which suggest 2 dimensional crystal growth of the buffer layer. For the optimization of the composition of the buffer layer, both the small lattice mismatch and the smooth surface maybe important in order to achieve the best MO performance of the BIG film. The Ga-substituted BIG films were also prepared by the same procedure. With decreasing the Ga substitution, the Faraday rotation decreased sharply. The substitution on the Fe3+ site seemed be biased on the tetragonal Fe3+ sites which caused the net magnetization of this system. These behaviors could be also observed for the BIGG films on GGG single crystal substrates [1].

Acknowledgements :

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