Method of manufacturing magnetic recording medium and magnetic recording medium manufactured using the same
View Patent ↗A method of manufacturing a magnetic recording medium with high recording density and enabling stable flight of a magnetic head, with high manufacturing yields, is provided. The method includes layering a magnetic layer, a protective layer, and a lubricating layer in order on a substrate, and forming a medium for transfer. The method further includes transferring a magnetic pattern to the medium for transfer, and flattening a surface of the lubricating layer of the medium for transfer for which the magnetic pattern transferring is completed. The surface of the lubricating layer is flattened either by wiping the surface of the lubricating layer using a member without a cutting effect, or by heating the surface of the lubricating layer.
1. A method of manufacturing a magnetic recording medium, comprising the steps of:
1) layering a magnetic layer, a protective layer, and a lubricating layer in that order on a substrate, and forming a medium including the substrate, magnetic layer, protective layer and lubricating layer;
2) transferring a magnetic pattern to the medium; and
3) flattening a surface of the lubricating layer of the medium when the magnetic pattern transferring is completed,
wherein the flattening step includes wiping the surface of the lubricating layer using a member without a cutting effect, and
wherein the flattening step is performed only after the step 2), without being performed before the step 2).
2. The method of claim 1 , wherein the member without a cutting effect comprises woven cloth or unwoven cloth.
3. The method of claim 1 , wherein the member without a cutting effect comprises a wiping film in which particles are bonded onto a film base by a bonding agent.
4. The method of claim 1 , further comprising a step of inspecting a surface smoothness of the medium between step 1) and step 2).
5. The method of claim 4 , wherein the inspecting step is performed by a glide test.
6. The method of claim 1 , further comprising a step of burnishing the medium after step 3), without being performed before the step 2), wherein the member used in the flattening step is formed of a non-abrasive material.
7. The method of claim 1 , wherein the protective layer of the medium formed in step 1) has a thickness of 3.0 nm or less.
8. The method of claim 1 , wherein the lubricating layer of the medium formed in step 1) has a thickness of 1.5 nm or less.
9. The method of claim 1 , wherein the medium formed in step 1) has a surface roughness Ra of 0.5 nm or less.
10. A method of manufacturing a magnetic recording medium, comprising the steps of:
1) layering a magnetic layer, a protective layer, and a lubricating layer in that order on a substrate, and forming a medium including the substrate, magnetic layer, protective layer and lubricating layer;
2) transferring a magnetic pattern to the medium; and
3) flattening a surface of the lubricating layer of the medium when the magnetic pattern transferring is completed,
wherein the flattening step includes heating the surface of the lubricating layer, and
wherein the flattening step is performed only after the step 2), without being performed before the step 2).
11. The method of claim 10 , further comprising a step of inspecting a surface smoothness of the medium between step 1) and step 2).
12. The method of claim 11 , wherein the inspecting step is performed by a glide test.
13. The method of claim 10 , further comprising a step of burnishing the medium after step 3), without being performed before the step 2), wherein the member used in the flattening step is formed of a non-abrasive material.
14. The method of claim 10 , wherein the protective layer of the medium formed in step 1) has a thickness of 3.0 nm or less.
15. The method of claim 10 , wherein the lubricating layer of the medium formed in step 1) has a thickness of 1.5 nm or less.
16. The method of claim 10 , wherein the medium formed in step 1) has a surface roughness Ra of 0.5 nm or less.
17. The method of claim 1 , further comprising a step of performing a glide test to inspect a surface smoothness of the medium,
wherein the glide test is performed only after the step 3), without being performed before the step 2).
18. The method of claim 10 , further comprising a step of performing a glide test to inspect a surface smoothness of the medium,
wherein the glide test is performed only after the step 3), without being performed before the step 2).
19. The method of claim 10 , wherein the heating of the surface of the lubricating layer includes inserting the medium into a furnace and leaving the medium in the furnace.