熱アシスト磁気記録におけるヘッドディスクインターフェイスに関する研究: レーザ照射による潤滑膜の減耗特性

摘要

To further increase recording density of disk storage drives, thermally-assisted magnetic recording can solve the fundamental issues of thermal fluctuation and is regarded as the keytechnology for achieving recording density of more than 1 Tb/in~2. In this technology, it is suggested that there is critical issues for the ultra-thin liquid lubricant films on the disk surfaces. Because they are heated to high temperature with laser beams. In this study, we focused on the thermal stability of the two lubricant film materials in thermally-assisted magnetic recording. In other words, the behavior of lubricant film under the laser heating was investigated and discussed experimentally. As a result, it was found that the effects of lubricant film thickness as well as the laser irradiation conditions on the lubricant film depletion were clarified. We also considered that the depletion mechanisms of lubricant film compared with the temperature programmed desorption spectroscopy (TPD) results.%次世代の超高密度磁気記録を実現させる技術として熱アシスト磁気記録が提案されている．この記録方式では，記録媒体がレーザ照射によって局所的に加熱されるため，ディスク表面に塗布されている潤滑膜の耐熱性が問題となる．そこで本研究では，レーザ照射条件や潤滑膜厚の違いがレーザ照射による潤滑膜の変化にどのような影響を与えるのかを調べた．また潤滑膜の減耗特性を昇温脱離ガス分析（Temperature programmed desorption spectroscqpy:TPD）を用いて考察した．