Lubricant for thin film storage media
View Patent ↗Embodiments relate to lubricants disposed over magnetic storage media, such as rotatable thin film magnetic discs. One embodiment comprises a lubricant compound of a fluoropolyether chain having one or more carbonyl-imide pairs. For example, the carbonyl-imide pair may be located at one end, both ends, and/or in the middle of the fluoropolyether chain.
1. A magnetic storage medium, comprising:
a carbon-overcoated magnetic layer; and
a lubricant topcoat on the carbon-overcoated magnetic layer, the lubricant topcoat comprising a fluoropolyether compound comprising a fluoropolyether chain and a carbonyl-imide pair, wherein the nitrogen of the imide group is linked to an alpha position carbon of the carbonyl group and the fluoropolyether chain is attached to carbonyl-imide pair.
2. The magnetic storage medium of claim 1 , wherein the lubricant topcoat has a thickness between about 10 angstroms and about 30 angstroms.
3. The magnetic storage medium of claim 1 , wherein the average molecular weight of the fluoropolyether compound is between about 2,000 and about 6,000 Daltons.
4. A method of manufacturing a magnetic storage medium of claim 1 , comprising:
forming a carbon protective overcoat over a magnetic layer to form the carbon-overcoated magnetic layer; and
applying the lubricant topcoat over the protective overcoat.
5. The method of claim 4 , wherein the fluoropolyether compound is fractionated prior to application over the carbon protective overcoat.
6. The method of claim 4 , wherein the lubricant topcoat is post-treated after application over the carbon protective overcoat.
7. The method of claim 4 , wherein the fluoropolyether compound is prepared by reacting a fluoropolyether chain having one or more functionalized end-groups with a imine compound to form the-carbonyl-imide pair.