CHEMISORBED LUBRICANTS FOR DATA STORAGE DEVICES
A lubricant adheres to a magnetic recording medium via at least one of chemisorption or bonding, and contains a perfluorinated polyether attached to or terminated with a functional group that is phosphonic acid, silanol or carboxylic acid, and may be: R 1 —R f —R 1 where R f is —CF 2 O(CF 2 CF 2 CF 2 CF 2 O) n —, —CF 2 O(CF 2 CF 2 CF 2 O) n CF 2 —, —CF 2 O[CF(CF 3 )CF 2 O] n CF 2 —, —CF 2 O(CF 2 CF 2 O) m (CF 2 O) n CF 2 —, —CF 2 O(CF 2 CF 2 O) n CF 2 —, n, m is from 1 to 100 and R 1 is the functional group. A lubricant is formed from a multiple ether segments according to formula: Re 1 —Rb 1 -Ri-Rc-Ri-Rb 2 —Re 2 ; where Rc includes perfluoroalkyl ether, Rb 1 and Rb 2 are, independently, a sidechain segment including a perfluoroalkyl ether, optional Ri independently is a divalent linking segment including a functional group including elements from periodic table Group 13-17, and of Re 1 and Re 2 are phosphonic acid, silanol or carboxylic acid. Lubricant synthesis includes reacting a perfluorinated polyether with a halogenated functional group, selected from phosphonic acid, silanol or carboxylic acid.
1 . A lubricant configured to be adsorbed by a magnetic recording medium, comprising:
a perfluorinated polyether terminated with a functional group,
wherein the functional group is capable of at least one of chemisorption or chemical bonding, and the functional group comprises at least one of phosphoric acid, silanol or carboxylic acid.
2 . The lubricant of claim 1 , wherein the lubricant has a structure:
R 1 —R f —R 1
where R f is —CF 2 O(CF 2 CF 2 CF 2 CF 2 O) n —, —CF 2 O(CF 2 CF 2 CF 2 O) n CF 2 —, —CF 2 O[CF(CF 3 )CF 2 O] n CF 2 —, —CF 2 O(CF 2 CF 2 O) m (CF 2 O) n CF 2 —, —CF 2 O(CF 2 CF 2 O) n CF 2 — and m, n are independently from 1 to 100 and R 1 is the functional group.
3 . The lubricant of claim 1 , wherein the lubricant has a structure:
R 1 —R f —R 1
where R f is —CF 2 O(CF 2 CF 2 O) n CF 2 —, and n is independently from 1 to 100 and R 1 is the functional group.
4 . The lubricant of claim 1 , where the functional group comprises:
5 . The lubricant of claim 1 , where the functional group comprises:
6 . The lubricant of claim 1 , wherein the functional group comprises:
7 . The lubricant of claim 1 , wherein the functional group comprises:
8 . The lubricant of claim 1 , wherein the functional group comprises:
9 . A magnetic recording medium comprising:
a substrate;
a magnetic recording layer on the substrate; and
an overcoat layer on the magnetic recording layer; and
the lubricant of claim 1 adhered to the overcoat layer.
10 . A data storage device configured for magnetic recording, comprising:
at least one magnetic head;
the magnetic recording medium according to claim 9 ;
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.
11 . The data storage device of claim 10 , wherein the lubricant has a structure:
R 1 —R f —R 1
where R f is —CF 2 O(CF 2 CF 2 O)nCF 2 —, n is from 1 to 100 and R 1 is a functional group.
12 . The data storage device of claim 10 , wherein the lubricant has a structure:
R 1 —R f —R 1
where R f is —CF 2 O(CF 2 CF 2 CF 2 CF 2 O) n —, —CF 2 O(CF 2 CF 2 CF 2 O) n CF 2 —, —CF 2 O[CF(CF 3 )CF 2 O] n CF 2 —, —CF 2 O(CF 2 CF 2 O) m (CF 2 O) n CF 2 —, —CF 2 O(CF 2 CF 2 O) n CF 2 — and m, n are independently from 1 to 100 and R 1 is a functional group.
13 . The data storage device of claim 12 , wherein the functional group comprises:
14 . A data storge 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;
wherein the slider is configured to write information to the magnetic recording layer using at least one of: heat assisted magnetic recording, energy assisted magnetic recording, or microwave assisted magnetic recording.
15 . A lubricant comprising:
a plurality of segments, each linked together by ether linkages according to a general formula:
Re 1 —Rb 1 -Ri-Rc-Ri-Rb 2 —Re 2 ;
wherein Rc is a divalent center segment including a perfluoroalkyl ether moiety;
wherein each of Rb 1 and Rb 2 is, independently, a sidechain segment including a perfluoroalkyl ether moiety;
wherein each Ri is optional, and independently is a divalent linking segment including a functional group including elements from Group 13-17 of the periodic table of the elements; and
wherein each of Re 1 and Re 2 is a functional group comprising at least one of phosphonic acid, silanol or carboxylic acid.
16 . A method of synthesizing a lubricant, comprising:
reacting a perfluorinated polyether with a halogenated functional group, wherein the functional group is phosphonic acid, silanol or carboxylic acid.
17 . The method of claim 16 , wherein the halogenated functional group is (2-bromethyl)phosphonic acid or 4-bromobenzylphosphonic acid,.
18 . The method of claim 16 , wherein the halogenated functional group is diethyl 2-bromoethylphosphonate or diethyl(4-brombenzyl)phosphonate.
19 . The method of claim 16 , wherein the halogenated functional group is (4-chlorophenyl)triethoxysilane or (4-bromphenyl)trimethoxysilane.
20 . The method of claim 16 , wherein the perfluorinated polyether is —CF 2 O(CF 2 CF 2 CF 2 CF 2 O) n —, —CF 2 O(CF 2 CF 2 CF 2 O) n CF 2 —, —CF 2 O[CF(CF 3 )CF 2 O] n CF 2 —, —CF 2 O(CF 2 CF 2 O) m (CF 2 O) n CF 2 —, —CF 2 O(CF 2 CF 2 O) n CF 2 — and m, n are independently from 1 to 100.
21 . The method of claim 17 , wherein the perfluorinated polyether is —CF 2 O(CF 2 CF 2 O) n CF 2 —, and n is independently from 1 to 100.