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A Method for Laser Zone Texturing of Glass Based Magnetic Media Using Nd:Yag Lasers

Published online by Cambridge University Press:  10 February 2011

M. P. Rosenblum  and
C. A. Ross
M. P. Rosenblum
Affiliation:
Komag Inc., 1704 Automation Parkway, San Jose, CA 95131
C. A. Ross
Affiliation:
Massachusetts Institute of Technology, Department of Materials Science and Engineering, Cambridge, MA 02139
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Abstract

Laser zone texturing of nickel-plated, aluminum based magnetic media has become a preferred method of providing a precisely controlled head landing zone. The Nd:YAG lasers used for this process are not suitable for directly texturing glass substrates. A novel method has been developed which allows the use of the existing Nd:YAG laser systems to zone texture glass based magnetic media.

An amorphous sputtered film of a non-magnetic Ni alloy provides a texturing layer which absorbs the laser pulse and controllably forms regular, small protrusions. Optimization of the alloy composition results in small cone-shaped bumps. Laser power sensitivity exhibits a region of invariance for a range of film thickness. This behavior provides a wide margin for manufacture by reducing the effect of thickness variation on laser bump height.

Disks fabricated using this form of laser zone texture exhibit excellent tribology performance. TEM images show the Ni alloy to be amorphous and featureless. The sputtered film does not influence the properties of the subsequently sputter deposited isotropic magnetic films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 517: Symposium F – Wide Bandgap Semiconductors for High Power, High Frequency , January 1998 , 427
Copyright
Copyright © Materials Research Society 1998

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