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MAGNETIC HEAD SLIDERS WITH Al2O3 SLIDING LAYER

IP.com Disclosure Number: IPCOM000034669D
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Hinkel, H: AUTHOR [+3]

Abstract

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.

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MAGNETIC HEAD SLIDERS WITH Al2O3 SLIDING LAYER

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. The Al2O3 layer is produced by anodic oxidation of a vapor deposited Al layer. The advantages of this method are that there is a good layer thickness control, that the generated layers are wear- resistant, that the porosity of the layers is adjustable over a wide range, and that there is a low process temperature, so that the read/ write head is not damaged. In addition, it is possible to adjust the porosity of the slider surface and thus to control lubricant retention.

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