High temperature lubricants for magnetic media

1. A lubricant comprising: a plurality of segments according to general formula (I), (II), or (III):

Re 1 -Rb 1 -Rc-Rb 2 -Re 2   (I);

Re 1 -Rb 1 -Re 2   (II); or

Re 1 -Rb 1 -(Rc-Rb 2 ) m -Re 2   (III);

wherein Rc, when present, is a divalent linking segment comprising an anchoring functional group engageable with a protective overcoat of a magnetic recording media;

wherein each Rb 1 and Rb 2 , when present, independently comprises a chain segment comprising at least one of a fluoroalkyl ether moiety, a fluoroalkenyl ether moiety, a perfluoroalkyl ether moiety, a perfluoroalkenyl ether moiety, or a combination thereof;

wherein each of Re 1 and Re 2 independently comprises a substituted cyclic anchoring functional group engageable with a protective overcoat of a magnetic recording media,

wherein Rc independently comprises a cyclic functional group comprising at least one of an alicyclic C 3 -C 50 alkyl radical, an alicyclic C 3 -C 50 alkenyl radical, a heterocyclic C 3 -C 50 radical, an aromatic C 5 -C 50 radical, a polycyclic aromatic C 10 -C 50 radical, a heteroaromatic C 5 -C 50 radical, a cyclotriphosphazine radical, or a combination thereof;

wherein one or more of Re 1 or Re 2 independently comprise a heterocyclic C 3 -C 50 radical, an aromatic C 5 -C 50 radical, a polycyclic aromatic C 10 -C 50 radical, a heteroaromatic C 5 -C 50 radical, a cyclotriphosphazine radical, or a combination thereof, with a bonding functionality γ to the cyclic or aromatic moiety;

wherein m is from 1 to 20.

2. The lubricant of claim 1 , wherein at least one anchoring functional group, at least one cyclic functional group, or a combination thereof, further comprises at least one of B, Si, a pnictogen, a chalcogen, a halogen, —OR*, —NR* 2 , —NR*—CO-R*, —O—CO-R*, —CO—O-R*, —SeR*, —TeR, —PR* 2 , —PO—OR*) 2 , —O—PO—(OR*) 2 , —N═P(NR* 2 ) 3 , —AsR* 2 , —SR*, —SO 2 —(OR*) 2 , —BR* 2 , —SiR* 3 , —(CH 2 ) q —SiR* 3 , —(CF 2 ) q —SiR* 3 , or a combination thereof, wherein q is 1 to 10 and each R* is, independently, a hydrogen, B, Si, a pnictogen, a chalcogen, a halogen, a saturated C 1 -C 50 radical, an unsaturated C 2 -C 50 radical, an aromatic C 4 -C 50 radical, a polycyclic aromatic C 5 -C 50 radical, a heteroaromatic C 5 -C 50 radical, an alicyclic C 3 -C 50 radical, and/or a heterocyclic C 2 -C 50 radical, and wherein two or more R* may join together to form a ring structure.

3. The lubricant of claim 1 , wherein at least one anchoring functional group comprises a hydroxyl (—OH) moiety.

4. The lubricant of claim 1 , wherein at least one substituted cyclic functional group independently comprises a substituted monovalent moiety comprising a formula selected from the group consisting of:

or a combination thereof, wherein the moiety is bonded to a respective segment “A” at any substitutable position.

5. The lubricant of claim 4 , wherein the cyclic functional group is further substituted with one or more functional groups comprising one or more of B, Si, a pnictogen, a chalcogen, a halogen, —OR*, —NR* 2 , —NR*—CO-R*, —O—CO-R*, —CO—O-R*, —SeR*, —TeR*, —PR* 2 , —PO—OR*) 2 , —O—PO—(OR*) 2 , —N═P(NR* 2 ) 3 , —AsR* 2 , —SR*, —SO 2 —(OR*) 2 , —BR* 2 , —SiR* 3 , —(CH 2 ) q —SiR* 3 , —(CF 2 ) q —SiR* 3 , or a combination thereof, wherein q is 1 to 10 and each R* is, independently, a hydrogen, B, Si, a pnictogen, a chalcogen, a halogen, a saturated C 1 -C 50 radical, an unsaturated C 2 -C 50 radical, an aromatic C 4 -C 50 radical, a polycyclic aromatic C 5 -C 50 radical, a heteroaromatic C 5 -C 50 radical, an alicyclic C 3 -C 50 radical, and/or a heterocyclic C 2 -C 50 radical, and wherein two or more R* may join together to form a ring structure.

6. The lubricant of claim 1 , wherein at least one cyclic functional group comprises at least one of a monovalent anisolyl radical, phenolic radical, resorcinolyl radical, catecholyl radical, hydroquinonyl radical, phloroglucinolyl radical, pyrogallolyl radical, phenalenyl radical, indolyl radical, adamantanyl radical, or a combination thereof.

7. The lubricant of claim 1 , wherein Rc, when present, comprises general formula (IV):

wherein each Y independently comprises:

(i) —CH 2 —;

(ii) —CF 2 —;

(iii) —CHF—;

(iv) CF 2 CF 2 CF 2 O(CF 2 CF 2 CF 2 CF 2 O) a CF 2 CF 2 CF 2 ;

(v) CF 2 CF 2 O(CF 2 CF 2 CF 2 O) a CF 2 CF 2 ;

(vi) CF 2 CF 2 O[CF(CF 3 )CF 2 O] a CF 2 CF 2 ;

(vii) CF 2 O(CF 2 CF 2 O) a (CF 2 O) b CF 2 ;

(viii) CF 2 O(CF 2 CF 2 O) a CF 2 ;

or a combination thereof;

wherein each a, when present, is independently from 1 to 20,

wherein each b, when present, is independently from 1 to 20;

wherein p is from 1 to 20; and

wherein R 1 is an anchoring functional group engageable with a protective overcoat of a magnetic recording media, comprising B, Si, a pnictogen, a chalcogen, a halogen, —OR*, —NR* 2 , —NR*—CO-R*, —O—CO-R*, —CO—O-R*, —SeR*, —TeR*, —PR* 2 , —PO—OR*) 2 , —O—PO—(OR*) 2 , —N═P(NR* 2 ) 3 , —AsR* 2 , —SR*, —SO 2 —(OR*) 2 , —BR* 2 , —SiR* 3 , —(CH 2 ) q —SiR* 3 , —(CF 2 ) q —SiR* 3 , or a combination thereof, wherein q is 1 to 10 and each R* is, independently, a hydrogen, B, Si, a pnictogen, a chalcogen, a halogen, a saturated C 1 -C 50 radical, an unsaturated C 2 -C 50 radical, an aromatic C 4 -C 50 radical, a polycyclic aromatic C 5 -C 50 radical, a heteroaromatic C 5 -C 50 radical, an alicyclic C 3 -C 50 radical, and/or a heterocyclic C 2 -C 50 radical, and wherein two or more R* may join together to form a ring structure.

8. The lubricant of claim 7 , wherein R 1 is a cyclic functional group comprising an alicyclic C 3 -C 50 alkyl radical, an alicyclic C 3 -C 50 alkenyl radical, a heterocyclic C 3 -C 50 radical, an aromatic C 5 -C 50 radical, a polycyclic aromatic C 10 -C 50 radical, a heteroaromatic C 5 -C 50 radical, a cyclotriphosphazine radical, or a combination thereof.

9. The lubricant of claim 8 , wherein at least one cyclic functional group further comprises B, Si, a pnictogen, a chalcogen, a halogen, —OR*, —NR* 2 , —NR*—CO-R*, —O—CO-R*, —CO—O-R*, —SeR*, —TeR*, —PR* 2 , —PO—OR*) 2 , —O—PO—(OR*) 2 , —N═P(NR* 2 ) 3 , —AsR* 2 , —SR*, —SO 2 —(OR*) 2 , —BR* 2 , —SiR* 3 , —(CH 2 ) q —SiR* 3 , —(CF 2 ) q —SiR* 3 , or a combination thereof, wherein q is 1 to 10 and each R* is, independently, a hydrogen, B, Si, a pnictogen, a chalcogen, a halogen, a saturated C 1 -C 50 radical, an unsaturated C 2 -C 50 radical, an aromatic C 4 -C 50 radical, a polycyclic aromatic C 5 -C 50 radical, a heteroaromatic C 5 -C 50 radical, an alicyclic C 3 -C 50 radical, and/or a heterocyclic C 2 -C 50 radical, and wherein two or more R* may join together to form a ring structure.

10. The lubricant of claim 8 , wherein R 1 comprises a hydroxyl moiety (—OH).

11. The lubricant of claim 1 , wherein Rc, when present, comprises general formula (V):

wherein each Q independently comprises:

(i) —CH 2 —;

(ii) —CF 2 —;

(iii) —CHF—;

(iv) CF 2 CF 2 CF 2 O(CF 2 CF 2 CF 2 CF 2 O) a CF 2 CF 2 CF 2 ;

(v) CF 2 CF 2 O(CF 2 CF 2 CF 2 O) a CF 2 CF 2 ;

(vi) CF 2 CF 2 O[CF(CF 3 )CF 2 O] a CF 2 CF 2 ;

(vii) CF 2 O(CF 2 CF 2 O) a (CF 2 O) b CF 2 ;

(viii) CF 2 O(CF 2 CF 2 O) a CF 2 ;

or a combination thereof;

wherein each a, when present, is independently from 1 to 20,

wherein each b, when present, is independently from 1 to 20;

wherein n is from 1 to 20; and

wherein R 1 is an anchoring functional group engageable with a protective overcoat of a magnetic recording media, comprising B, Si, a pnictogen, a chalcogen, a halogen, —OR*, —NR* 2 , —NR*—CO-R*, —O—CO-R*, —CO—O-R*, —SeR*, —TeR*, —PR* 2 , —PO—OR*) 2 , —O—PO—(OR*) 2 , —N═P(NR* 2 ) 3 , —AsR* 2 , —SR*, —SO 2 —(OR*) 2 , —BR* 2 , —SiR* 3 , —(CH 2 ) q —SiR* 3 , —(CF 2 ) q —SiR* 3 , or a combination thereof, wherein q is 1 to 10 and each R* is, independently, a hydrogen, B, Si, a pnictogen, a chalcogen, a halogen, a saturated C 1 -C 50 radical, an unsaturated C 2 -C 50 radical, an aromatic C 4 -C 50 radical, a polycyclic aromatic C 5 -C 50 radical, a heteroaromatic C 5 -C 50 radical, an alicyclic C 3 -C 50 radical, and/or a heterocyclic C 2 -C 50 radical, wherein two or more R* may join together to form a ring structure.

12. The lubricant of claim 11 , wherein R 1 is a cyclic functional group including at least one of an alicyclic C 3 -C 50 alkyl radical, an alicyclic C 3 -C 50 alkenyl radical, a heterocyclic C 3 -C 50 radical, an aromatic C 5 -C 50 radical, a polycyclic aromatic C 10 -C 50 radical, a heteroaromatic C 5 -C 50 radical, a cyclotriphosphazine radical, or a combination thereof.

13. The lubricant of claim 12 , wherein at least one cyclic functional group further comprises B, Si, a pnictogen, a chalcogen, a halogen, —OR*, —NR* 2 , —NR*—CO-R*, —O—CO-R*, —CO—O-R*, —SeR*, —TeR*, —PR* 2 , —PO—OR*) 2 , —O—PO—(OR*) 2 , —N═P(NR* 2 ) 3 , —AsR* 2 , —SR*, —SO 2 —(OR*) 2 , —BR* 2 , —SiR* 3 , —(CH 2 ) q —SiR* 3 , —(CF 2 ) q —SiR* 3 , or a combination thereof, wherein q is 1 to 10 and each R* is, independently, a hydrogen, B, Si, a pnictogen, a chalcogen, a halogen, a saturated C 1 -C 50 radical, an unsaturated C 2 -C 50 radical, an aromatic C 2 -C 50 radical, a polycyclic aromatic C 5 -C 50 radical, a heteroaromatic C 5 -C 50 radical, an alicyclic C 3 -C 50 radical, and/or a heterocyclic C 2 -C 50 radical, and wherein two or more R* may join together to form a ring structure.

14. The lubricant of claim 11 , wherein R 1 comprises a hydroxyl moiety (—OH).

15. The lubricant of claim 1 , wherein Rc, when present, comprises an ester functional group comprising general formula (VI), (VII), or a combination thereof:

wherein t, when present, is from 1 to 20; and

wherein s, when present, is from 1 to 20.

16. The lubricant of claim 1 , wherein Rb 1 , and Rb 2 when present, comprises the formula:

(iv) CF 2 CF 2 CF 2 O(CF 2 CF 2 CF 2 CF 2 O) a CF 2 CF 2 CF 2 ;

(v) CF 2 CF 2 O(CF 2 CF 2 CF 2 O) a CF 2 CF 2 ;

(vi) CF 2 CF 2 O[CF(CF 3 )CF 2 O] a CF 2 CF 2 ;

(vii) CF 2 O(CF 2 CF 2 O) a (CF 2 O) b CF 2 ;

(viii) CF 2 O(CF 2 CF 2 O) a CF 2 ;

or a combination thereof;

wherein each a is, independently from 1 to 20, and

wherein each b, when present, is independently from 1 to 20.

17. The lubricant of claim 1 , wherein each of Re 1 and Re 2 independently comprises general formula (VIII):

wherein R 1 is an anchoring functional group engageable with a protective overcoat of a magnetic recording medium, comprising B, Si, a pnictogen, a chalcogen, a halogen, —OR*, —NR* 2 , —NR*—CO-R*, —O—CO-R*, —CO—O-R*, —SeR*, —TeR*, —PR* 2 , —PO—(OR*) 2 , —O—PO—(OR*) 2 , —N═P(NR* 2 ) 3 , —AsR* 2 , —SR*, —SO 2 —(OR*) 2 , —BR* 2 , —SiR* 3 , —(CH 2 ) q —SiR* 3 , —(CF 2 ) q —SiR* 3 , or a combination thereof, wherein q is 1 to 10 and each R* is, independently, a hydrogen, B, Si, a pnictogen, a chalcogen, a halogen, a saturated C 1 -C 50 radical, an unsaturated C 2 -C 50 radical, an aromatic C 4 -C 50 radical, a polycyclic aromatic C 5 -C 50 radical, a heteroaromatic C 5 -C 50 radical, an alicyclic C 3 -C 50 radical, and/or a heterocyclic C 2 -C 50 radical, wherein two or more R* may join together to form a ring structure; and

wherein R 1 is a cyclic functional group comprising an alicyclic C 3 -C 50 alkyl radical, an alicyclic C 3 -C 50 alkenyl radical, a heterocyclic C 3 -C 50 radical, an aromatic C 5 -C 50 radical, a polycyclic aromatic C 10 -C 50 radical, a heteroaromatic C 5 -C 50 radical, a cyclotriphosphazine radical, or a combination thereof.

18. The lubricant of claim 17 , wherein R 1 comprises a hydroxyl moiety (—OH).

19. The lubricant of claim 1 , comprising general formula (IX):

wherein a is from 1 to 20; b is from 1 to 20; and c is from 1 to 20.

20. The lubricant of claim 1 , comprising general formula (X):

wherein a is from 1 to 20; b is from 1 to 20; and c is from 1 to 20.

21. The lubricant of claim 1 , comprising a weight average molecular weight from about 0.1 to 20 kiloDaltons (kDa) and a polydispersity of greater than or equal to about 1 and less than or equal to about 2.

22. The lubricant of claim 1 , comprising a dewetting thickness of less than or equal to about 10 nanometers.

23. A magnetic recording medium, comprising:

a magnetic recording layer on a substrate;

a protective overcoat on the magnetic recording layer; and

a lubricant layer comprising the lubricant according to claim 1 on the protective overcoat.

24. The magnetic recording medium of claim 23 , wherein the lubricant has a bonding percentage of about 20% to less than about 100%, corresponding to a degree of bonding of the lubricant to the total area of an upper surface of the protective overcoat.

25. A data storage system, comprising:

at least one magnetic head;

a magnetic recording medium including the lubricant of claim 1 ;

a drive mechanism for positioning the at least one magnetic head over the magnetic recording medium; and

a controller electrically coupled to the at least one magnetic head for controlling operation of the at least one magnetic head.

26. A data storage system, comprising:

a slider comprising at least one magnetic head and an air bearing surface (ABS), wherein a lubricant according to claim 1 is disposed on the ABS; and

a magnetic recording medium including a magnetic recording layer;

wherein the slider is configured to write information to the magnetic recording layer using heat assisted magnetic recording (HAMR).