Method of forming a magnetic media

Details Method of forming a magnetic media Method of forming a magnetic media

1996-11-27

1999-01-12

Pianalto, Bernard

Coating processes

Direct application of electrical, magnetic, wave, or...

Pretreatment of substrate or post-treatment of coated substrate

427130, 427131, 427597, B05D 300

Patent

active

058584749

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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patent: 5278703 (1994-01-01), Rub et al.
patent: 5350618 (1994-09-01), Togawa et al.

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