Browse Prior Art Database

Sealing of Debris in N58 Slider Pockets

IP.com Disclosure Number: IPCOM000110638D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 2 page(s) / 81K

Publishing Venue

IBM

Related People

Grebe, K: AUTHOR [+5]

Abstract

The very rough surface of the etched pocket of N58 sliders is a potential source of particulate debris. As this pocket cannot be actively cleaned with maximum efficiency, it is proposed to seal the debris under a suitable coating. With CVD PARYLENE*, void-free coating and strong planarization have been observed. Apart from sealing debris, such a planarizing coating layer, in contrast to rough surfaces, has no negative effect on the hydrodynamic performance of sliders.

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Sealing of Debris in N58 Slider Pockets

       The very rough surface of the etched pocket of N58
sliders is a potential source of particulate debris.  As this pocket
cannot be actively cleaned with maximum efficiency, it is proposed to
seal the debris under a suitable coating.  With CVD PARYLENE*,
void-free coating and strong planarization have been observed.  Apart
from sealing debris, such a planarizing coating layer, in contrast to
rough surfaces, has no negative effect on the hydrodynamic
performance of sliders.

      Particulate contamination is a major source of failure of
magnetic storage devices.  As a high bit density requires the
magnetic head to be in close proximity to the magnetic disk, sliders
fly at heights well below 1 mm above the disk.  Therefore, even small
particles at the head/disk interface can cause severe damage by
either scratching the disk or the magnetic head.

      Particles may be deposited on the slider ABS (air bearing
surface) or the magnetic disk during the production of these parts,
or they may fall onto the ABS or disk from other parts within the
disk drive.  The latter may happen during assembly, or, even worse,
during use of the disk drive in the field.

      To prevent particle-induced damage, all parts must be
efficiently cleaned before head/disk assembly.  One part that is most
difficult to clean efficiently is the N58 slider, especially the
slider pocket.

      The slider pocket is machined by RIE (reactive ion etching) or
by excimer laser etching the N58 slider to some 15 mm depth.  As is
known, independently of the kind of etching, the etched pocket has a
very rough bottom surface with protrusions and intrusions of various
sizes.  The negative effects of this rough pocket surface are
twofold.  First, the rough pocket surface is a source of particulate
contamination.  Ultrasonic clean...