Method of producing thin-film storage disk
First Claim
1. A method of producing a magnetic disk having a substantially isotropic, uniform-thickness magnetic film, said method comprisingplacing a planar circular substrate on a pallet for movement, linearly and without rotation, along a path through a sputtering chamber having a first target adapted to sputter a crystalline underlayer onto the substrate, and a second, downstream, target adapted to sputter the magnetic film onto the underlayer,moving the substrate through a first region underlying the first target, under shielding conditions provided by a fixed-position baffle which (a) limit deposition of sputtered material onto the substrate to substrate regions which substantially underlie the target and (b) provide substantially symmetrical, substantially unhindered side-to-side deposition onto the substrate, andmoving the substrate through a second region underlying the second target under shielding conditions provided by a fixed-position baffle which (a) provide substantially symmetrical, substantially unhindered side-to-side deposition onto the substrate, and (b) provide less shielding between the target and substrate, on progressing radially outwardly away from a center region of the substrate paralleling the path of travel, toward opposite side regions of the substrate.
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Abstract
A method of producing a thin-film magnetic disk having high coercivity and magnetic remanence, good loop squareness, and low fluctuation in peak-to-peak recording signal amplitude over an entire circular recording path. The novel aspects of the method which contribute to the performance characteristics of the disk are (a) layering a 300-1,000 Å magnetic film containing between about 70-88% cobalt, 10-28% nickel, and 2-12% chromium over a 1,000-4,000 Å chromium underlayer; (b) forming the film and underlayer under sputtering disposition conditions which prevent low-angle asymmetrical sputtering; and (c) shielding the disk substrate during sputtering in a manner which produces substantially uniform-thickness deposition.
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Citations
4 Claims
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1. A method of producing a magnetic disk having a substantially isotropic, uniform-thickness magnetic film, said method comprising
placing a planar circular substrate on a pallet for movement, linearly and without rotation, along a path through a sputtering chamber having a first target adapted to sputter a crystalline underlayer onto the substrate, and a second, downstream, target adapted to sputter the magnetic film onto the underlayer, moving the substrate through a first region underlying the first target, under shielding conditions provided by a fixed-position baffle which (a) limit deposition of sputtered material onto the substrate to substrate regions which substantially underlie the target and (b) provide substantially symmetrical, substantially unhindered side-to-side deposition onto the substrate, and moving the substrate through a second region underlying the second target under shielding conditions provided by a fixed-position baffle which (a) provide substantially symmetrical, substantially unhindered side-to-side deposition onto the substrate, and (b) provide less shielding between the target and substrate, on progressing radially outwardly away from a center region of the substrate paralleling the path of travel, toward opposite side regions of the substrate.
Specification