| This paper firstly based on the model of electron transition and the deposited process of films to calculate the Faraday angle's frequency chart. From the chart we confirmed the material has enhanced Faraday angle near violet and get the range of optimum compositions. Secondly we have done system research on the process of prepared Bi Al substituted garnet multilayer magneto-optical films by pyrolysis, We have prepared 2 inch and 3.5inch large area multilayer magneto-optical films. at the same time, We have solved the noise caused by the diffraction of crystal boundary and the irregular of recording domain form the theory and experiment. We have used the methods of rapid recurrent annealing and Rb doping both of which have gained excellent fined crystal grains. And have almost solved the noise caused by crystal boundary. Finally We have approximately simulated the recording domain of Bi~ Al substituted garnet magneto-optical films, have done much works on the research of the mechanism of reducing the grains to Nano size and the test of magneto-optical performance. Have got some helpful and new results as fellows:1.by the formula for the general magneto-optical recording domain simulation, We have simulated the recording domain of the garnet magneto-optical films approximately, and have done the research on the relations between the regularity of recording bit and the magnetic and thermo-magnetic properties of materials.2. Use the model of electronic transition for the split of ground state and thesplit of both ground state and excite state to explain the origin of the Faraday effect. By the frequency chart of Faraday angle, we have confirmed the Bi substituted garnet material抯 enhanced magneto optical effect at blue-green and near violet wave band and get the range of optimum compositions.3.Use the specialty of the material抯 prepared process, We have calculated the frequency chart of the Faraday angle for multilayer films by the model of magnetic-coupled faraday effect, The result confirmed the material has the enhanced Faraday effect at the blue-green and near violet wave band again.4.We have solved the difficulties in the process of material prepared such as the difficult dissolved of rare oxide~ the aggregate of glue solution and the control of crystallizing temperature. Have reconstructed the process equipment, and designed the special spin-flat which the substrate was absorbed by a vacuum pump, and firstly prepared 2inch and 3.5inch large area magneto-optical multilayer films successfully.5.We have developed the high stability.~ high precision magneto-optical testing system controlled by computer which firstly use the timing dividing calculation to eliminate the interrupt of laser source fluctuating and the high linearity Faraday modulator to calibrate, By which we have tested the O~ H~ and T~ of much samples.6.We have done research on several methods to reduce the grains to Nano size. have used the rapid recurrent annealing first time to reduce the crystalsize, have analyzed the mechanism of reducing size, and reduced the crystal size below 5Onm;at the same time, We have used the methods of Rb doping and double layer films to realize the prepare of large area (3.Sinch) Bi substituted Nanocrystalline DyIG magneto-optical films, Rb doping film also has the size below 5Onm,the crystal grains are uniformity.6.We have done the research on the uniformity of large area(3.5inch) films prepared by vacuum magnetic control sputtering and pyrolysis, form the result of ingredient test at the different points on the same film, the error is between ?% ,The non-uniform of depth is exist, through the research on the spinning process from theory and a large amount of experiments, We have developed the uniform of depth.
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