MAGNETIC HEAD SLIDERS WITH Al2O3 SLIDING LAYER
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-27
The sliding face, i.e., the bottom side, of an electrically conductive slider, consisting of a ceramic mixture with about 70 percent Al2O3 and 30 percent TiC, is provided with a very thin (about 50 to 100 nm) wear- resistant Al2O3 layer. This improves the tribological properties and reduces the required lubricant quantity, thus preventing head stiction. The electrically insulating Al2O3, provided it is sufficiently thin (~~50 nm), i.e., small compared to the flight height of the slider of about 500 nm, does not lead to a detrimental electric field between disk and slider. As a result, the electric field lines extend substantially inside the slider and not in the space between the slider and disk, where they would be undesirable and promote the transfer of debris from the disk to the slider.