Developing Magneto-optical discs by applying new technology derrite platir

1)应用于磁光存储器，我们必须在直径为8-12英寸的大范围内均匀地沉积质量良好的磁膜。我们在本研究中改进了铁氧体电镀方法，以适应这一应用。发明了“薄液膜法”和“喷雾旋涂法”，使得在8英寸光盘的整个区域均匀地形成高质量的薄膜。2)为了节省实验人力，我们选择了反应和氧化溶液的pH值，而不需要使用无氧水。3)为了降低磁光记录中的介质噪声，我们找到了获得表面光洁度好、尺寸小的薄膜的镀膜条件。通过使用无尘室和滤光片，胶片质量进一步提高。添加葡聚糖或蔗糖使薄膜的颗粒尺寸变小。4)通过选择Fe_&lt；3-x&gt；Co_xO_4中的x值，我们可以在固溶体尖晶石的镀膜中获得适合于磁光盘的矫直磁力。5)通过将基片表面暴露在空气等离子体中，可以增强铁氧体镀膜在丙烯和聚碳酸酯等塑料基片上的附着力。

1) Applying to magneto-optical memoty, wemust deposite magnetic film of good quality uniformly over a wide area of a disc as large as 8-12" in diameter. We have improved in this study ferrite plating methods to fit for this application. "Thin liquid filmmethod" and "spray spin-coating method" were invented, which facilitated formation of good-quality film uniformly over the whole area of an 8" disc.2) To save labor in experiment on sprey-spin coating method, which is the best one for prouducing magneto-optical discs, we have so chosen the pH values of reaction and oxidizing solutions that we dont need to use oxygen-free water. This facilitated mass production of magneto-optical disc by the ferrite plating.3) To reduce media noise in magneto-optical recording, we have found plating conditions on which film if good surface smoothness and small size is obtained. The film quality further improved by using a clean room and filters. Adding dextran or sucrose made the film smaller in grain size.4) By choosing value of x in Fe_<3-x> Co_xO_4, we can obtain coercive magnetic force fitted for magneto-optical disc in plated films of the solid solution spinel.5) Adhesion of the ferrite-plating film onto substrate of plastics such as acryl and polycarbonate (which are used for magneto-oprical discs) can be enhanced by exposing the surface of the substrate to an air plasma.