US 5,685,958 A · Method of fabricating a magnetic recording medium

Abstract

A magnetic recording medium is constructed with a substrate made of glass, one or two underlayers, and a magnetic film. In order that the easy magnetization axis of the magnetic film is parallel to the magnetic film, an underlayer having an NaCl crystallographic structure is superposed on the substrate. A magnetic film made of a Co based alloy having a hexagonal close packed crystallographic structure is formed on this underlayer, putting an underlayer made of a material having a body centered cubic crystallographic structure therebetween at need. Magnetic anisotropy of the magnetic film is increased by forming grooves in a predetermined direction in a surface portion of the substrate. These grooves play a role also for defining the orientation of the underlayer made of the material having an NaCl crystallographic structure.

Claims6

Dependent claims

A method for fabricating a magnetic recording medium comprising a step of forming, on a substrate, a <100>

oriented film made of a material having a NaCl crystallographic structure by a physical vapor deposition method so that it has a thickness greater than 10 nm and smaller than 100 .mu.m;
a step of forming a film made of a material having a body centered cubic crystallographic structure further thereon by a physical vapor deposition method so that it has a thickness smaller than 1 .mu.m;
and a step of forming a magnetic film made of a Co based alloy having a hexagonal close packed structure still further thereon by a physical vapor deposition method so that it has a thickness greater than 2 nm and smaller than 100 nm.

Dependencies are inferred from the claim text.

Facts

Application

08/729,381Filed 17 Oct 1996 · continuation

Priority

JP 5-04884710 Mar 1993

Granted

11 Nov 1997

Term ends

Not estimatedThe source records don’t support an estimate.

Classification17 codes

G11B 5/657
Characterised by its composition: containing inorganic, non-oxide compound of Si, N, P, B, H or C, e.g. in metal alloy or compound
G11B 5/656
Characterised by its composition: containing Co
G11B 5/737
Two or more non-magnetic underlayers, e.g. seed layers or barrier layers: physical structure of underlayer, e.g. texture
G11B 5/8404
Processes or apparatus specially adapted for manufacturing record carriers: manufacturing base layers

Method of fabricating a magnetic recording medium

Life of this patent

Method of fabricating a magnetic recording medium

Life of this patent

Abstract

Claims6