Development of Granular-type Perpendicular Magnetic Recording Media
نویسنده
چکیده
Hard disk drives (HDDs) were developed in 1956 and initially were applied mainly as external memories for mainframe computers. Subsequent advances in HDD technologies leading to higher areal density, smaller size and lower cost have brought HDDs into widespread use for their convenience. HDDs are now the mainstream external memories used for personal computers and mainframe computers. Recently, the technology of longitudinal recording, which has been in use for a long time, is approaching its technical limit. Perpendicular magnetic recording technology, however, which realizes higher areal density, has been edging closer to practical use in recent years. In the year 2005 and thereafter, large capacity and small size HDDs that utilize perpendicular magnet recording technology are expected to acquire a large share of the market. In the ubiquitous society of the 21st century, we predict that the HDD market will continue to expand as HDDs come to be used in vehicle equipment, home information appliances and cellular phones (Fig. 1). The main component that is mounted in these HDDs and that stores more than 100 Gbytes (800 × 109 bits) of data is the magnetic recording media which we have developed. In 1985, Fuji Electric succeeded in developing a sputtered Co-alloy magnetic recording media to replace the coated γ -Fe2O3 media that had been in use previously. Since then, Fuji Electric has been a major manufacturer of media and a worldwide supplier of longitudinal magnetic recording media. Recently, Fuji Electric succeeded in developing the world’s highest areal density perpendicular magnetic recording media. Below, we shall describe the development status of our perpendicular magnetic recording media.
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تاریخ انتشار 2004