Ultra High Density Perpendicular Magnetic Recording

本研究的目的是实现理想的磁头/介质系统，探索垂直磁记录中超高密度记录的可行性。在本研究中，我们开发了以下三种新技术：(a)利用在单极头的主极膜边缘制造的小缺口进行磁畴控制技术。仅使用2mum轨宽的单极头就获得了4OOnV_<o-p>/[mum^*匝数^*(m/s)]的再现电压。这种再现电压高于高灵敏度环头的再现电压。(b)研制了用于高速率制备高密度垂直磁记录介质的新型溅射靶材。新的溅射靶实现了等离子体的约束和低压低温溅射。这为制备具有高垂直取向、高结晶度和较窄磁各向异性场分布的磁性足够软的Ni-Fe背层和Co-Cr层提供了方便。我们证明了利用这种新型溅射靶材制备用于高密度记录的垂直磁记录磁带介质是可能的。(c)表面光滑、单极头支撑机构不飞的Co-Cr/Ni-Fe硬盘介质相结合的滑动接触记录技术。滑动接触记录消除了间距损失，并派生了记录介质固有的高密度记录性能。该系统大大提高了再现电压的耐磨性和包络度。在使用这些新技术的垂直磁记录中，我们实现了6700比特/毫米的最高-6dB记录密度。在线性比特密度为4000比特/毫米，磁道密度为10磁道/毫米的情况下，实现了10^<-9>的误差率，保证了作为硬盘驱动器的实际应用。

The purpose of this study, was to achieve the ideal head/medium system and to pursue the feasibility of ultra high density recording in perpendicular magnetic recording. We developed the following three new technologies in this study :(a) Magnetic domain control technique using the small notches fabricated at the edge of a main-pole film of a single-pole head. The reproduced voltage of 4OOnV_<o-p>/[mum^*turn^*(m/s)] was obtained using only 2mum trackwidth single-pole head. This reproduced voltage is higher than that of the highly sensitive ring head.(b) New sputtering target was developed for high rate fabrication of high density perpendicular "magnetic recording media. The new sputtering target enables the confinement of the plasma and low gas pressure and low temperature sputtering. These are convenient features to fabricate magnetically soft enough Ni-Fe backlayer and Co-Cr layer with high perpendicular orientation, high crystallinity and narrower magnetic anisotropy field distribution. We proved that the fabrication of perpendicular magnetic recording tape media for high density recording is possible using this new sputtering target.(c) Sliding contact recording technology combining the Co-Cr/Ni-Fe hard disk media with smooth surface and non-flying single-pole head supporting mechanism. Sliding contact recording excludes spacing loss, and derives the intrinsic high density recording performance of recording media. The pass wear durability and envelope of the reproduced voltage was drastically improved in this system.In perpendicular magnetic recording using these new technologies, we achieved the highest -6dB recording density of 6, 700 bits/mm. The error rate of 10^<-9>, which guarantees the practical application as a hard disk drive, was realized at linear bit density of 4, 000 bits/mm and track density of 10 tracks/mm.