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Enhanced corrosion test for disks and sliders using AFM Nano scratching

IP.com Disclosure Number: IPCOM000015837D
Original Publication Date: 2002-Apr-07
Included in the Prior Art Database: 2003-Jun-21
Document File: 2 page(s) / 349K

Publishing Venue

IBM

Abstract

To improve or guarantie stable quality of disk and slider surfaces it is necessary to understand corrosion behavior. Mechanical damages like scratches within the coatings are one reason of corrosion. With the following method it will be possible to clarify the influence of such scratches. Atomic force microscope with diamond tip is used for scratching with a controlled variation of scratch depths between 0,5 and 8 nm. Topography of scratched area will then be compared before and after stress test with high humidity and temperature. Changes of topography caused by stress test will show how sensitive surfaces are to damages. To find the scratched area on disks after test, it will be necessary to mark the area additionally with large marks of a candela system before scratching. Slider needs no additional marking. Very small differences between topography before and after stress test can be found with a special program of A. Wienss (PhD thesis: Nanotribology armorpher Kohlenstoffschichten, 2001, Saarbr├╝cken). This program corrects the drift within the pictures and substracts them from each other. 1

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Enhanced corrosion test for disks and sliders using AFM Nano scratching

    To improve or guarantie stable quality of disk and slider surfaces it is necessary to understand corrosion behavior. Mechanical damages like scratches within the coatings are one reason of corrosion. With the following method it will be possible to clarify the influence of such scratches.

    Atomic force microscope with diamond tip is used for scratching with a controlled variation of scratch depths between 0,5 and 8 nm. Topography of scratched area will then be compared before and after stress test with high humidity and temperature. Changes of topography caused by stress test will show how sensitive surfaces are to damages. To find the scratched area on disks after test, it will be necessary to mark the area additionally with large marks of a candela system before scratching. Slider needs no additional marking.

    Very small differences between topography before and after stress test can be found with a special program of A. Wienss (PhD thesis: Nanotribology armorpher Kohlenstoffschichten, 2001, Saarbrücken). This program corrects the drift within the pictures and substracts them from each other.

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