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硬盘存储密度的增加促使磁头的飞行高度不断降低.降低磁头飞行高度所导致的润滑剂在磁头与磁盘之间的转移已成为影响磁头飞行稳定性的一个重要因素.本文采用改进后的粗粒珠簧模型,应用分子动力学模拟方法,对磁头/磁盘之间润滑剂转移的机理进行研究.分析了磁盘表面润滑膜厚度、润滑剂种类以及磁头表面局部温度差对磁头/磁盘之间润滑剂转移量的影响.研究结果表明:转移到磁头上的润滑剂的体积随磁盘表面润滑膜厚度的增加而急剧增加;增加单个分子中羟基的数量,可以显著减少转移到磁头上的润滑剂的体积;磁头表面的局部高温可增加转移到磁头上的润滑剂的体积,且增加单个分子中羟基的数量可显著改善局部温度差对磁头/磁盘之间润滑剂转移的影响.
The increase of the storage density of the hard disk drives the flying height of the head to decrease continuously.The transfer of the lubricant between the head and the disk caused by reducing the height of the flying head has become an important factor affecting the flight stability of the head.In this paper, Spring model, the mechanism of lubricant transfer between head and disk was studied by using molecular dynamics simulation method.The lubricant transfer between head / disk was analyzed.The thickness of lubricant film on the surface of the disk, the type of lubricant and the local temperature difference of head surface were analyzed. The results show that the volume of the lubricant transferred to the magnetic head increases sharply with the increase of the thickness of the lubricating film on the disk surface. Increasing the number of hydroxyl groups in a single molecule can significantly reduce the volume of the lubricant transferred to the magnetic head. Local high temperatures on the head surface can increase the volume of lubricant transferred to the head and increasing the number of hydroxyl groups in a single molecule can significantly improve the effect of localized temperature differences on head / disk lubricant transfer.