PFPE Ether Lubricant for Thin Magnetic Recording Layers
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Solution Overview
Problem
Existing magnetic recording media face challenges in achieving reduced floating height of the magnetic head while maintaining sufficient chemical substance resistance, wear resistance, and corrosion resistance due to insufficient lubricating layer thickness.
Innovation Solution
A fluorine-containing ether compound with a specific structure, including perfluoropolyether chains and divalent linking groups with polar groups, is used to form a lubricating layer that enhances adhesion to the protective layer, ensuring uniform coating and improved resistance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the lubricating layer is reduced to decrease floating height, then the magnetic head can be positioned closer to the disc surface, but the chemical substance resistance and wear resistance of the magnetic recording medium are lowered
Solution Approach 1:
The invention changes the chemical composition parameters of the lubricating layer by using a fluorine-containing ether compound with specific molecular structure (Formula 1), containing perfluoropolyether chains and polar groups. This chemical parameter change enables the formation of a thin lubricating layer that maintains excellent chemical substance resistance and wear resistance while reducing floating height.
Solution Approach 2:
The lubricating layer is formed as a composite structure combining the fluorine-containing ether compound (Formula 1) with unique molecular architecture featuring perfluoropolyether chains and polar functional groups. This composite material design provides both thin film formation capability and superior durability, resolving the contradiction between reduced thickness and maintained resistance properties.
2Length of moving object
If the thickness of the lubricating layer is reduced, then the floating height decreases, but the corrosion resistance of the magnetic recording medium becomes insufficient
Solution Approach 1:
The invention modifies the chemical parameters of the lubricating layer by employing a fluorine-containing ether compound (Formula 1) with specific molecular characteristics including perfluoropolyether chains and polar groups. This parameter change enables the thin lubricating layer to provide sufficient corrosion resistance while reducing floating height.
Solution Approach 2:
The fluorine-containing ether compound forms a thin, easily applicable lubricating layer that provides protective functions despite minimal thickness. The compound's molecular structure ensures that even in a thin layer configuration, it delivers adequate corrosion protection.
3Reliability
If a conventional lubricant is used to form a thick lubricating layer, then chemical substance resistance and wear resistance are improved, but the floating height of the magnetic head increases
Solution Approach 1:
The invention changes the chemical composition and molecular structure parameters of the lubricant from conventional types to a fluorine-containing ether compound (Formula 1) with perfluoropolyether chains and polar groups. This parameter change allows formation of a thin lubricating layer that provides excellent resistance properties without increasing floating height.
Solution Approach 2:
The fluorine-containing ether compound (Formula 1) provides localized high-performance lubrication with its unique molecular structure featuring perfluoropolyether chains and polar functional groups. This local quality enhancement enables thin film formation with superior resistance properties, avoiding the need for thick layers.
4Productivity
If the lubricating layer is made thinner, then productivity and device performance are improved, but the durability of the magnetic recording medium is compromised
Solution Approach 1:
The invention changes the chemical parameters of the lubricating layer by using a fluorine-containing ether compound (Formula 1) with specific molecular structure containing perfluoropolyether chains and polar groups. This parameter change enables thin lubricating layer formation that maintains excellent durability, supporting high recording density and device performance without compromising longevity.
Solution Approach 2:
The lubricating layer is designed as a composite material system based on the fluorine-containing ether compound (Formula 1) with unique molecular architecture. This composite structure provides both thin film characteristics for high productivity and superior durability through the combined effects of perfluoropolyether chains and polar functional groups.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The fluorine-containing ether compound forms a lubricating layer with favorable chemical substance resistance, wear resistance, and corrosion resistance, allowing for a thinner layer that maintains reliability and durability of the magnetic recording medium.
Implementation Method 1
the fluorine-containing ether compound forms a lubricating layer with favorable chemical substance resistance, wear resistance, and corrosion resistance, allowing for a thinner layer that maintains reliability and durability
Data Source
AI summary
There is provided a fluorine-containing ether compound represented by the following formula: R1—R2—CH2—R3[—CH2—R4—CH2R3′]n—CH2—R5—R6 (n is 1 or 2; R3 and R3′ are a perfluoropolyether chain; R4 is a divalent linking group having one polar group; R2 and R5 are a divalent linking group having one or more polar groups; R2 has an oxygen atom at an end that is bonded to R1; R5 has an oxygen atom at an end that is bonded to R6; R1 and R6 in end group bonded to an oxygen atom at an end of R2 or R5; and R1 and R6 are an organic group having 1 to 50 carbon atoms, and at least one of them is a group in which a carbonyl carbon atom or nitrogen atom constituting an amide bond is bonded to a carbon atom of an organic group having 1 to 8 carbon atoms).