Aromatic and aromatic-like containing media lubricants for data storage devices
An aromatic or aromatic-like group(s) containing lubricant configured to be adsorbed by a magnetic recording media is formed from where Ar is an aromatic group, polyaromatic hydrocarbon (PAH), annulene, cycloalkane or heterocycle, m=1-10, R1 and R2 are moieties containing first and second polar groups, respectively, R f is a perfluorinated polyether, o=1-10, p=0-10, and q=1-10. The first or second polar group may independently be hydroxyl, phosphonic acid, silanol or carboxylic acid. In an embodiment, the lubricant has the formula: where Ar is a system formed from a PAH, annulene, cycloalkane or heterocycle, X, Y and Z can independently be hydroxyl, a phosphonic acid moiety, a silanol or a carboxylic acid moiety, and where R f may be CF 2 O(CF 2 CF 2 ) n CF 2 — where n is 1 to 100. Synthesizing the lubricant may entail reacting parabromophenol with (Ar) m (R1 o R f R2 p ) q .
1 . A lubricant configured to be adsorbed by a magnetic recording medium, comprising:
where
Ar is a polyaromatic hydrocarbon ring system,
R1 is a moiety containing a first polar group,
R2 is a moiety containing a second polar group,
R f is a perfluorinated polyether,
is from 1 to 10,
p is from 0 to 10, and
q is from 2 to 10.
2 . The lubricant of claim 1 , wherein the first polar group comprises at least one selected from the group consisting of hydroxyl, phosphonic acid, silanol and carboxylic acid.
3 . The lubricant of claim 1 , wherein the second polar group comprises at least one selected from the group consisting of hydroxyl, phosphonic acid, silanol and carboxylic acid.
4 . The lubricant of claim 1 , wherein
R f is —CF 2 CF 2 O(CF 2 CF 2 CF 2 CF 2 O) s CF 2 CF 2 —, —CF 2 CF 2 O(CF 2 CF 2 CF 2 O) s CF 2 CF 2 —, —CF 2 CF 2 O[CF(CF 3 )CF 2 O] s CF 2 CF 2 —, —CF 2 O(CF 2 CF 2 O) r (CF 2 O) s CF 2 —, or —CF 2 O(CF 2 CF 2 O) s CF 2 —, and r, s are independently from 1 to 100.
5 . The lubricant of claim 1 , wherein
R f is —CF 2 O(CF 2 CF 2 O) s CF 2 —, and s is from 1 to 100.
6 . The lubricant of claim 1 , wherein Ar is selected from the group consisting of naphthalene, phenalene, B phenanthrene, pyrene, and triphenylene.
7 . The lubricant of claim 1 , having the formula:
where R f is CF 2 O(CF 2 CF 2 ) n CF 2 — where n is from 1 to 100 or R f is —CF 2 CF 2 O(CF 2 CF 2 CF 2 CF 2 O) s CF 2 CF 2 —, —CF 2 CF 2 O(CF 2 CF 2 CF 2 O) s CF 2 CF 2 —, —CF 2 CF 2 O[CF(CF 3 )CF 2 O] s CF 2 CF 2 —, —CF 2 O(CF 2 CF 2 O) r (CF 2 O) s CF 2 —, or —CF 2 O(CF 2 CF 2 O) s CF 2 —, and r, s are independently from 1 to 100.
8 . The lubricant of claim 1 , having the formula:
where R f is CF 2 O(CF 2 CF 2 ) n CF 2 — where n is from 1 to 100 or R f is —CF 2 CF 2 O(CF 2 CF 2 CF 2 CF 2 O) s CF 2 CF 2 —, —CF 2 CF 2 O(CF 2 CF 2 CF 2 O) s CF 2 CF 2 —, —CF 2 CF 2 O[CF(CF 3 )CF 2 O] s CF 2 CF 2 —, —CF 2 O(CF 2 CF 2 O) r (CF 2 O) s CF 2 —, or —CF 2 O(CF 2 CF 2 O) s CF 2 —, and r, s are independently from 1 to 100.
9 . The lubricant of claim 1 , wherein p is from 1 to 10.
10 . A data storage device configured for magnetic recording, comprising:
a magnetic recording medium comprising:
a substrate;
a magnetic recording layer on the substrate;
an overcoat layer on the magnetic recording layer; and
the lubricant of claim 1 adsorbed by the overcoat layer.
11 . The data storage device of claim 10 , wherein
R f is —CF 2 CF 2 O(CF 2 CF 2 CF 2 CF 2 O) s CF 2 CF 2 —, —CF 2 CF 2 O(CF 2 CF 2 CF 2 O) s CF 2 CF 2 —, —CF 2 CF 2 O[CF(CF 3 )CF 2 O] s CF 2 CF 2 —, —CF 2 O(CF 2 CF 2 O) r (CF 2 O) s CF 2 —, or —CF 2 O(CF 2 CF 2 O) s CF 2 —, and r, s are independently from 1 to 100.
12 . The data storage device of claim 10 , wherein
R f is —CF 2 O(CF 2 CF 2 O) s CF 2 —, and s is from 1 to 100.
13 . The data storage device of claim 10 ,
wherein Ar is selected from the group consisting of naphthalene, phenalene, phenanthrene, pyrene, and triphenylene.
14 . The data storage device of claim 10 , wherein the lubricant has the formula:
where R f is CF 2 O(CF 2 CF 2 ) n CF 2 — where n is from 1 to 100 or R f is —CF 2 CF 2 O(CF 2 CF 2 CF 2 CF 2 O) s CF 2 CF 2 —, —CF 2 CF 2 O(CF 2 CF 2 CF 2 O) s CF 2 CF 2 —, —CF 2 CF 2 O[CF(CF 3 )CF 2 O] s CF 2 CF 2 —, —CF 2 O(CF 2 CF 2 O) r (CF 2 O) s CF 2 —, or —CF 2 O(CF 2 CF 2 O) s CF 2 —, and r, s are independently from 1 to 100.
15 . The data storage device of claim 10 , wherein the lubricant has the formula:
where R f is CF 2 O(CF 2 CF 2 ) n CF 2 — where n is from 1 to 100 or R f is —CF 2 CF 2 O(CF 2 CF 2 CF 2 CF 2 O) s CF 2 CF 2 —, —CF 2 CF 2 O(CF 2 CF 2 CF 2 O) s CF 2 CF 2 —, —CF 2 CF 2 O[CF(CF 3 )CF 2 O] s CF 2 CF 2 —, —CF 2 O(CF 2 CF 2 O) r (CF 2 O) s CF 2 —, or —CF 2 O(CF 2 CF 2 O) s CF 2 —, and r, s are independently from 1 to 100.
16 . A magnetic recording medium, comprising:
a substrate;
a magnetic recording layer on the substrate;
an overcoat layer on the magnetic recording layer; and
the lubricant of claim 1 adsorbed by the overcoat layer.
17 . A data storage system, comprising;
at least one magnetic head;
a magnetic recording medium coated with a layer of the lubricant according 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.
18 . A data storage system, comprising:
a slider comprising at least one magnetic head and an air bearing surface, wherein a thin film of the lubricant according to claim 1 is disposed on the air bearing surface; and
a magnetic recording medium including a magnetic recording layer; and
wherein the slider is configured to write information to the magnetic recording layer using heat assisted magnetic recording, energy assisted magnetic recording, or microwave assisted magnetic recording.
19 . A lubricant configured to be adsorbed by a magnetic recording medium, comprising:
where Ar is a polyaromatic hydrocarbon ring system, X, Y and Z are independently hydroxyl, a phosphoric acid moiety, a silanol or a carboxylic acid moiety, and where R f is CF 2 O(CF 2 CF 2 ) n CF 2 — where n is from 1 to 100 or R f is —CF 2 CF 2 O(CF 2 CF 2 CF 2 CF 2 O) s CF 2 CF 2 —, —CF 2 CF 2 O(CF 2 CF 2 CF 2 O) s CF 2 CF 2 —, —CF 2 CF 2 O[CF(CF 3 )CF 2 O] s CF 2 CF 2 —, —CF 2 O(CF 2 CF 2 O) r (CF 2 O) s CF 2 —, —CF 2 O(CF 2 CF 2 O) s CF 2 —, and r, s are independently from 1 to 100.
20 . The lubricant of claim 19 , wherein Ar is selected from the group consisting of naphthalene, phenalene, phenanthrene, pyrene, and triphenylene.
21 . A method of synthesizing a lubricant, comprising:
reacting 4-bromophenol with
where
Ar is a polyaromatic hydrocarbon ring system,
R1 is a moiety containing a first polar group,
R2 is a moiety containing a second polar group,
R f is a perfluorinated polyether,
is from 1 to 10,
p is from 0 to 10, and
q is from 2 to 10.
22 . The method of claim 21 , wherein R f is CF 2 O(CF 2 CF 2 ) n CF 2 — where n is from 1 to 100.
23 . The method of claim 21 , wherein R f —CF 2 CF 2 O(CF 2 CF 2 CF 2 CF 2 O) s CF 2 CF 2 —, —CF 2 CF 2 O(CF 2 CF 2 CF 2 O) s CF 2 CF 2 —, —CF 2 CF 2 O[CF(CF 3 )CF 2 O] s CF 2 CF 2 —, —CF 2 O(CF 2 CF 2 O) r (CF 2 O) s CF 2 —, —CF 2 O(CF 2 CF 2 O) s CF 2 —, and r, s are independently from 1 to 100.
24 . The method of claim 21 , wherein the first polar group is selected from the group consisting of hydroxyl, phosphonic acid, silanol or carboxylic acid.
25 . The method of claim 21 , wherein p is from 1 to 10.