Magnetic media and magnetic recording devices using fluorine compounds
View Patent ↗According to one embodiment, a lubricant includes a perfluoropolyether having a chemical structure of: wherein Rf is at least one of: —CF 2 O(CF 2 CF 2 O) m (CF 2 O) n CF 2 — and —CF 2 CF 2 O(CF 2 CF 2 CF 2 O) k CF 2 CF 2 —, with m representing 0 or a positive integer, n representing 0 or a positive integer, and k representing 0 or a positive integer, and wherein R1 to R4 are selected from a group consisting of —H or with at least one of R1 to R4 being
1. A lubricant, comprising a perfluoropolyether having a chemical structure of:
wherein Rf is at least one of: —CF 2 O(CF 2 CF 2 O) m (CF 2 O) n CF 2 — and —CF 2 CF 2 O(CF 2 CF 2 CF 2 O) k CF 2 CF 2 —, with m representing 0 or a positive integer, n representing 0 or a positive integer, and k representing 0 or a positive integer, and wherein R1, R2, R3 and R4 are selected from a group consisting of —H or
with at least one of R1, R2, R3 and R4 being
2. A magnetic recording medium, comprising:
a magnetic recording layer above a nonmagnetic substrate;
a protective film above the magnetic recording layer; and
a lubricant as recited in claim 1 positioned above the protective film.
3. A magnetic data storage system, comprising:
at least one magnetic head;
the magnetic recording medium as recited in claim 2 ;
a drive mechanism for passing the magnetic recording medium over the at least one magnetic head; and
a controller electrically coupled to the at least one magnetic head for controlling operation of the at least one magnetic head.
4. A magnetic recording medium, comprising:
a magnetic recording layer above a nonmagnetic substrate, the magnetic recording layer comprising concavities and protrusions on an upper surface thereof, wherein the protrusions of the magnetic recording layer are magnetic regions and the concavities of the magnetic recording layer are nonmagnetic regions; and
a lubricant as recited in claim 1 positioned above the magnetic recording layer.
5. The magnetic recording medium as recited in claim 4 , further comprising a protective film positioned above the magnetic recording layer and below the lubricant.
6. A magnetic data storage system, comprising:
at least one magnetic head;
the magnetic recording medium as recited in claim 5 ;
a drive mechanism for passing the magnetic recording medium over the at least one magnetic head; and
a controller electrically coupled to the at least one magnetic head for controlling operation of the at least one magnetic head.
7. The lubricant as recited in claim 1 , characterized in that an average molecular weight of the lubricant is from about 1,500 to about 4,500 and a molecular weight distribution of the lubricant is not more than about 1.5.
8. A lubricant, comprising a perfluoropolyether having a chemical structure of:
wherein Rf comprises: —CF 2 O(CF 2 CF 2 O) m (CF 2 O) n CF 2 —, with m representing 0 or a positive integer, n representing 0 or a positive integer, and wherein R1, R2, R3 and R4 are selected from a group consisting of —H or
with at least one of R1, R2, R3 and R4 being
9. The lubricant as recited in claim 8 , characterized in that an average molecular weight of the lubricant is from about 1,500 to about 4,500 and a molecular weight distribution of the lubricant is not more than about 1.5.
10. A magnetic recording medium, comprising:
a magnetic recording layer above a nonmagnetic substrate;
a protective film above the magnetic recording layer; and
a lubricant as recited in claim 9 positioned above the protective film.
11. A magnetic data storage system, comprising:
at least one magnetic head;
the magnetic recording medium as recited in claim 10 ;
a drive mechanism for passing the magnetic recording medium over the at least one magnetic head; and
a controller electrically coupled to the at least one magnetic head for controlling operation of the at least one magnetic head.
12. A magnetic recording medium, comprising:
a magnetic recording layer above a nonmagnetic substrate, the magnetic recording layer comprising concavities and protrusions on an upper surface thereof, wherein the protrusions of the magnetic recording layer are magnetic regions and the concavities of the magnetic recording layer are nonmagnetic regions; and
a lubricant as recited in claim 9 positioned above the magnetic recording layer.
13. The magnetic recording medium as recited in claim 12 , further comprising a protective film positioned above the magnetic recording layer and below the lubricant.
14. A magnetic data storage system, comprising:
at least one magnetic head;
the magnetic recording medium as recited in claim 13 ;
a drive mechanism for passing the magnetic recording medium over the at least one magnetic head; and
a controller electrically coupled to the at least one magnetic head for controlling operation of the at least one magnetic head.
15. A lubricant, comprising a perfluoropolyether having a chemical structure of:
wherein Rf comprises: —CF 2 CF 2 O(CF 2 CF 2 CF 2 O) k CF 2 CF 2 —, with k representing 0 or a positive integer, wherein R1 to R4 are selected from a group consisting of —H or
with at least one of R1, R2, R3 and R4 being
16. The lubricant as recited in claim 15 , characterized in that an average molecular weight of the lubricant is from about 1,500 to about 4,500 and a molecular weight distribution of the lubricant is not more than about 1.5.
17. A magnetic recording medium, comprising:
a magnetic recording layer above a nonmagnetic substrate;
a protective film above the magnetic recording layer; and
a lubricant as recited in claim 15 positioned above the protective film.
18. A magnetic data storage system, comprising:
at least one magnetic head;
the magnetic recording medium as recited in claim 17 ;
a drive mechanism for passing the magnetic recording medium over the at least one magnetic head; and
a controller electrically coupled to the at least one magnetic head for controlling operation of the at least one magnetic head.
19. A magnetic recording medium, comprising:
a magnetic recording layer above a nonmagnetic substrate, the magnetic recording layer comprising concavities and protrusions on an upper surface thereof, wherein the protrusions of the magnetic recording layer are magnetic regions and the concavities of the magnetic recording layer are nonmagnetic regions;
a protective film positioned above the magnetic recording layer and below the lubricant; and
a lubricant as recited in claim 15 positioned above the protective film.
20. A magnetic data storage system, comprising:
at least one magnetic head;
the magnetic recording medium as recited in claim 19 ;
a drive mechanism for passing the magnetic recording medium over the at least one magnetic head; and
a controller electrically coupled to the at least one magnetic head for controlling operation of the at least one magnetic head.