Media lubricant for high temperature application
A lubricant layer for a magnetic recording medium may include a perfluoropolyether having monomer units and end groups selected to provide high thermal stability and good reliability.
1. A magnetic recording medium comprising:
a substrate;
a magnetic recording layer; and
a lubricant layer, wherein the lubricant layer comprises a molecule having the formula:
and
wherein m≧3; n≧1; r=1; 12≦p≦200; 0≦q≦200; and X and Y are end groups.
2. The magnetic recording medium of claim 1 , wherein X is selected from the group consisting of
3. The magnetic recording medium of claim 1 , wherein Y is selected from the group consisting of
4. The magnetic recording medium of claim 1 , wherein the molecule has a molecular weight between approximately 2,000 g/mol and approximately 40,000 g/mol.
5. The magnetic recording medium of claim 1 , wherein the lubricant layer comprises a thickness between approximately 0.5 nm and approximately 2 nm.
6. The magnetic recording medium of claim 5 , wherein the lubricant layer comprises a thickness between approximately 1 nm and approximately 1.5 nm.
7. The magnetic recording medium of claim 1 , wherein the molecule has a take-off temperature of greater than approximately 400° C.
8. A method comprising:
depositing a lubricant layer on a surface of a magnetic recording medium, wherein the lubricant layer comprises a molecule having the formula:
and
wherein m≧3; n≧1; r=1; 12≦p≦200; 0≦q≦200; and X and Y are end groups.
9. The method of claim 8 , wherein depositing the lubricant layer comprises at least one of dip-coating, depositing by vapor lube, electrostatic spraying the lubricant layer on the surface of the magnetic recording medium.
10. The method of claim 8 , further comprising:
applying a treatment to the lubricant layer, wherein the treatment comprises at least one of a thermal treatment, an electron beam treatment, a gamma radiation treatment, a UV radiation treatment or an IR radiation treatment.
11. The method of claim 8 , wherein Xis selected from the group consisting of
12. The method of claim 8 , wherein Y is selected from the group consisting of
13. The method of claim 8 , wherein the molecule has a molecular weight between approximately 2,000 g/mol and approximately 40,000 g/mol.
14. The method of claim 8 , wherein the lubricant layer comprises a thickness between approximately 0.5 nm and approximately 2 nm.
15. The method of claim 14 , wherein the lubricant layer comprises a thickness between approximately 1 nm and approximately 1.5 nm.
16. The method of claim 8 , wherein the molecule has a take-off temperature of greater than approximately 400° C.
17. A magnetic recording medium comprising:
a substrate;
a magnetic recording layer; and
a lubricant layer, wherein the lubricant layer comprises a molecule having the formula:
wherein m≧3; n≧1; 12≦p≦200; 0≦q≦200; X is selected from the group consisting of
and Y is selected from the group consisting of
18. The magnetic recording medium of claim 17 , wherein the molecule has a molecular weight between approximately 2,000 g/mol and approximately 40,000 g/mol.
19. The magnetic recording medium of claim 17 , wherein the lubricant layer comprises a thickness between approximately 0.5 nm and approximately 2 nm.
20. The magnetic recording medium of claim 19 , wherein the lubricant layer comprises a thickness between approximately 1 nm and approximately 1.5 nm.
21. The magnetic recording medium of claim 17 , wherein the molecule has a take-off temperature of greater than approximately 400° C.