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Silicon Magnetic Head Slider With Sapphire Rails

IP.com Disclosure Number: IPCOM000041473D
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Elsner, G: AUTHOR [+4]

Abstract

It is suggested to apply a thin sapphire surface coating on the rails of a silicon magnetic head slider by molecular beam epitaxy (MBE). Magnetic heads of present-day disc storage systems produce on the disc, in their start/stop phase, abrasion of coating which is reduced by the lubrication of the disc. As the lube causes flight problems (e.g., lube-pick up), efforts are made to develop disc storage systems without lubrication of the disc. Using a magnetic head of pure silicon results in unsatisfactory start/stop behavior on unlubricated discs. The great advantage of such a head, however, is that it can be made with well-known conventional processes. Furthermore, electronics for the R/W element can be directly integrated in the slider.

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Silicon Magnetic Head Slider With Sapphire Rails

It is suggested to apply a thin sapphire surface coating on the rails of a silicon magnetic head slider by molecular beam epitaxy (MBE). Magnetic heads of present-day disc storage systems produce on the disc, in their start/stop phase, abrasion of coating which is reduced by the lubrication of the disc. As the lube causes flight problems (e.g., lube-pick up), efforts are made to develop disc storage systems without lubrication of the disc. Using a magnetic head of pure silicon results in unsatisfactory start/stop behavior on unlubricated discs. The great advantage of such a head, however, is that it can be made with well-known conventional processes. Furthermore, electronics for the R/W element can be directly integrated in the slider. Using a pure sapphire head is expensive, and the material has a tendency of breaking during processing. With (11-20 or (112- 0 or (0001) orientation, however, the sapphire has the advantage of an extremely low adhesive transfer of coating to the slider during operation of the disc/slider system. The epitaxial growth of a molecular monocrystal (a-Al2O3) film on an element monocrystal (Si) combines the advantages of sapphire and silicon, and avoids the above-mentioned disadvantages of the materials taken individually. An MBE arrangement of sapphire on silicon is schematically illustrated in the figure. There, reference number 1 represents the heating block for heating the substrate-car...