HIGH TEMPERATURE LUBRICANTS FOR MAGNETIC MEDIA HAVING AROMATIC LINKER MOIETY

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

wherein Rc is a non-fluorinated divalent linking segment comprising at least one least one first anchoring functional group engageable with a protective overcoat of a magnetic recording medium;

wherein each Re 1 and Re 2 is a moiety having as rotational energy barrier that is greater than the rotational energy barrier of CH 2 ;

wherein each Rb 1 and Rb 2 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; and

wherein each of Rv 1 and Rv 2 , when present, independently comprises a moiety having at least one second anchoring functional group engageable with the protective overcoat of the magnetic recording medium.

2 . The lubricant of claim 1 , wherein the at least one first and second anchoring functional groups each 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 the at least one first and second anchoring functional groups each comprises at least one of —OH, —NH 2 , —NH—CO—H, —O—CO—H, —CO—O—H, —SeH, —TeH, —PH 2 , —PO—(OH) 2 , —O—PO—(OH) 2 , —N═P(NH 2 ) 3 , —AsH 2 , —SH, —SO 2 —(OH) 2 , —BH 2 , —SiH 3 , —(CH 2 ) q —SiH 3 , —(CF 2 ) q —SiH 3 , or a combination thereof.

4 . The lubricant of claim 1 , wherein the at least one first and second anchoring functional groups each comprises a hydroxyl (-OH) moiety.

5 . The lubricant of claim 1 , wherein Re 1 and Re 2 each independently comprise —CF 2 —, —NH—, C═NH, C═NHCH 3 , —N═N—, —O—HP—O—O—, —SiH 2 —, Si(C 6 H 6 ) 2 — or at least one aromatic ring is selected from the group consisting of anisole, benzene, naphthalene, anthracene, phenanthrene, dibenz[a,h,]anthracene, pyrene and benzopyrene.

6 . The lubricant of claim 1 , wherein —Re 1 —Rc—Re 2— comprises 2 aromatic rings separated by a non-fluorinated linking segment to which the at least one anchoring functional group is attached.

7 . The lubricant of claim 1 , wherein —Re 1 —Rc—Re 2 — comprises 2 aromatic rings separated by a non-fluorinated linking segment containing at least one ether moiety to which the at least one anchoring functional group is attached.

8 . The lubricant of claim 1 , wherein —Re 1 —Rc—Re 2 — comprises:

where R L , if present, is C n M n+2 , wherein M is H or F, and n is from 1 to 10.

9 . The lubricant of claim 1 , wherein —Re 1 —Rc—Re 2 — comprises:

10 . The lubricant of claim 1 , wherein Rb 1 and Rb 2 comprises general formula (II):

wherein each Y independently comprises:

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 each at least one R 1 is H or 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, and wherein two or more R* may join together to form a ring structure.

11 . The lubricant of claim 1 , which comprises:

12 . 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.

13 . The magnetic recording medium of claim 12 , wherein the lubricant has a uniformity of about 0.2 to 0.3 Å at a lubricant thickness of between about 6 to 10 Å.

14 . 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.

15 . 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).

16 . A lubricant comprising a plurality of segments according to general formula (I):

wherein Rc is a non-fluorinated divalent linking segment comprising at least one first anchoring functional group engageable with a protective overcoat of a magnetic recording medium;

wherein each Re 1 and Re 2 is an aromatic ring;

wherein each Rb 1 and Rb 2 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; and

wherein each of Rv 1 and Rv 2 , when present, independently comprises a moiety having at least one second anchoring functional group engageable with the protective overcoat of the magnetic recording medium.

17 . The lubricant of claim 16 , wherein the at least one first and second anchoring functional groups each 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.

18 . The lubricant of claim 16 , wherein the at least one first and second anchoring functional groups each comprises at least one of —OH, —NH 2 , —NH—CO—H, —O—CO—H, —CO—O—H, —SeH, —TeH, —PH 2 , —PO—(OH) 2 , —O—PO—(OH) 2 , —N═P(NH 2 ) 3 , —AsH 2 , —SH, —SO 2 —(OH) 2 , —BH 2 , —SiH 3 , —(CH 2 ) q —SiH 3 , —(CF 2 ) q —SiH 3 , or a combination thereof.

19 . The lubricant of claim 16 , wherein the at least one first and second anchoring functional groups each comprises a hydroxyl (—OH) moiety.

20 . The lubricant of claim 16 , wherein Re 1 and Re 2 each independently comprise at least one aromatic ring selected from the group consisting of: anisole, benzene, naphthalene, anthracene, phenanthrene, dibenz[a,h]anthracene, pyrene and benzopyrene.