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外存储装置特别是磁盘的磁记录介质,现在广泛使用的是r-Fe_2O_3磁胶。使用磁胶,目前实际可达到的水平是:线密度为200位/毫米,道密度约15道/毫米。今后,随着存储器容量和速度的提高以及成本的下降,将有必要进一步提高记录密度。一般来说,为了提高记录密度,需要把介质层做得更薄并提高矫顽力。为弥补由于介质层变薄而造成的输出幅度降低,有必要提高剩余磁通密度,需要减小磁头浮动间隙以及改进磁头等。其中,最主要的是把介质层做得更薄和减小浮动间隙。对于涂布介质,最近,随着浮动间隙的减小,希望改进抗磁头划盘特性,也就是说,提高介质表面精度,减小磁头负荷,采用磁头接触起动、停止的形式以及使用润滑剂。为了提高记录密度,希望采用薄介质层和定向涂布方
External storage devices, especially magnetic disk recording media, is now widely used r-Fe_2O_3 magnet. The use of magnetic glue, the current level is actually achievable: linear density of 200 / mm, the road density of about 15 / mm. In the future, it will be necessary to further increase the recording density as the memory capacity and speed increase and the cost decreases. In general, in order to increase the recording density, it is necessary to make the dielectric layer thinner and to increase the coercive force. To compensate for the decrease in output due to thinning of the dielectric layer, it is necessary to increase the residual flux density, reduce the head floating gap, and improve the head and the like. Among them, the most important thing is to make the media layer thinner and reduce the floating gap. Recently, with the reduction of the flying gap, it has been desired to improve the anti-head padding characteristics for the coating medium, that is, to improve the surface accuracy of the medium, to reduce the head load, to start and stop with the head, to use a lubricant, and the like. In order to increase the recording density, it is desirable to use a thin dielectric layer and a directional coating