Discrete track media produced by underlayer laser ablation

Details Discrete track media produced by underlayer laser ablation Discrete track media produced by underlayer laser ablation

1997-10-09

2000-10-31

Kiliman, Leszek

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428336, 428694T, 428694TS, 428694TC, 428694TR, 428694SG, 428900, 2041922, 360135, G11B 566

Patent

active

061399361

ABSTRACT:
The invention provides discrete track magnetic recording media and methods for their fabrication. A discrete track servo pattern is imposed on an underlayer, over which a magnetic recording layer is deposited. The pattern is preferably imposed by selective laser ablation of the underlayer. Ideally the underlayer comprises sputtered carbon, which has been found to improve the signal-to-noise ratio of the subsequent magnetic layer. Optionally, a contact start/stop zone having a relatively rough surface texture is imposed, also by selective laser ablation of the underlayer.

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Dericotte, S. et al. "Advancements in the Development of Plastic Hark Disks with Pre-Embossed Servo Patterns," Corporate Research Laboratories, Sony Corporation, 1993.
S.E. Lambert et al. "Beyond Discrete Tracks: Other Aspects of Patterned Media," J. Appl. Phys. 69(8): Apr, 1991; pp. 4724-4726.

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