Abstract
To further increase recording density of hard disk drives (HDDs), it is necessary to reduce the flying height of magnetic head. Recently, the flying height of magnetic head is under 2nm by using Dynamic Flying Height (DFH) control. To more reduce the flying height, we studied the light contact recording which means that DFH protrusion is sliding on the lubricant film surface. We analyzed the DFH slider dynamics by acoustic emission (AE) from the Pzt element attached on the head suspension. As a result the different vibration modes were measured the contact of sliders with lubricant surface and carbon surface. In additions, it was found that the magnitude of the slider vibration at continuous contact with between the lubricant film depends on the lubricant material. In other words, Z-dol2000S showed lower vibration than Z-tetraol2000S.
