Magnetic media with permanently defined non-magnetic tracks and

Details Magnetic media with permanently defined non-magnetic tracks and Magnetic media with permanently defined non-magnetic tracks and

1998-02-18

2000-11-28

Kiliman, Leszek

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428694T, 428694TR, 428694BR, 428694TS, 428141, 428900, G11B 566

Patent

active

061532819

ABSTRACT:
A magnetic medium has permanently defined boundaries between tracks and a consistent surface smoothness. The crystallographic structure of the magnetic medium is modified at the track boundaries, so the grains of the magnetic thin film permanently take on a relatively non-magnetic structure as compared to the grains of the magnetic thin film within the tracks. Servo patterns on the magnetic medium may be permanently defined at the same time the track boundaries are permanently defined. Laser ablation, laser heating to an amorphous structure, photolithography, perpendicular deposition, ion milling, reverse sputtering, and ion implantation can be used individually or in combination, with either the magnetic layer or the underlayer, to create the relatively non-magnetic areas.

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