STUDIES ON HIGH-DENSITY AND LARGE-RECORDING-CAPACITY PERPENDICULAR MAGNETIC RECORDING SYSTEM

本课题旨在探讨垂直磁记录技术应用于大容量外设存储系统的可行性，并为图像文件记录系统的设计提供指导。本课题取得的成果如下：(1)研制了高灵敏度的主极驱动垂直磁头。采用Fe-Si多层薄膜代替Co-system薄膜，在该垂直磁头的主极上易于进行饱和记录，并在高密度下获得优异的记录性能。这种磁头的记录和再现灵敏度是我们迄今为止使用的辅助杆驱动的垂直磁头的几倍。(2)找到了制备高结晶取向、高记录分辨率、高产率垂直记录介质的条件。(3)采用主杆驱动的垂直磁头和3.5英寸软盘介质，保证了超过1000万次的耐久性，可以实现2000位/mm的线性位密度、21道/mm的磁道密度和小于10^<-5>的误码率的数据记录。此外，我们还成功地实现了静态图像的数码记录。在这些记录条件下，未格式化的记录容量估计为磁盘介质两边各20兆字节。至此，本项目的目的已基本达到。

The purpose of this project is to investigate the feasibility of application of perpendicular magnetic recording to the large-recording-capacity peripheral memory systems and to establish the guidelines to design a image file recording system.The obtained results in this project are as follows: (1) The highly sensitive main-pole driven perpendicular magnetic head was developed. Instead of a Co-system thin film, an Fe-Si multi-layer film was introduced to the main-pole of this perpendicular head to perform the saturation recording easily and to obtain superior recording performances at high densities. The recording and reproducing sensitivity of this head is several times as high as that of an auxiliary-pole driven perpendicular head which we have used thus far. (2) The conditions to fabricate the perpendicular recording media with a high crystalline orientation and a high recording resolution at a high-production-rate was found. (3) We have confirmed that the data recording was possible at a linear bit density of 2000 bits/mm, a track density of 21 tracks/mm and a bit error rate less than 10^<-5> by using the mainpole driven perpendicular head and the 3.5-inches flexible disk medium for which the durability over 10 million passes was ensured. Moreover, we have suceeded in digital recording of the still-pictures. The unformatted recording capacity in these recording conditions is estimated to be 20 mega-Bytes per both sides of disk media. Thus the purpose of this project has been almost achieved.