Magnetic Recording Medium Surface Fluorine Control
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Solution Overview
Problem
Magnetic recording media face challenges in achieving both excellent electromagnetic conversion characteristics and low friction coefficients, as increased smoothness of the magnetic layer surface leads to high friction coefficients, causing stability issues and potential sticking or scraping during data recording and reproduction.
Innovation Solution
A magnetic recording medium with a non-magnetic support and a magnetic layer containing ferromagnetic powder, where the surface arithmetic average roughness is 2.2 nm or less, and specific fluorine concentration levels are maintained to optimize electromagnetic conversion and friction characteristics, using techniques like X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry for analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the smoothness of the magnetic layer surface is increased to reduce spacing loss, then electromagnetic conversion characteristics are improved, but the friction coefficient increases causing deterioration in running stability
Solution Approach 1:
The patent applies parameter changes by precisely controlling the surface roughness parameter (Ra ≤ 2.2 nm) and introducing fluorine-containing compounds with specific concentration ranges (5-50 atom %) to modify the friction characteristics while maintaining smoothness for good electromagnetic conversion
Solution Approach 2:
The patent uses composite materials by combining ferromagnetic powder with fluorine-containing compounds in the magnetic layer, creating a composite structure that simultaneously achieves low friction coefficient and good electromagnetic conversion characteristics through the synergistic effect of the components
2Object-affected harmful factors
If the friction coefficient is reduced to improve running stability, then sticking and scraping are prevented, but electromagnetic conversion characteristics may deteriorate
Solution Approach 1:
The patent changes material parameters by introducing fluorine-containing compounds with specific concentration ranges (5-50 atom %) and controlling surface roughness (Ra ≤ 2.2 nm) to reduce friction while maintaining electromagnetic conversion characteristics through optimized composition
Solution Approach 2:
The patent applies local quality by concentrating fluorine-containing compounds specifically at the surface region of the magnetic layer where friction occurs, while maintaining the bulk magnetic properties necessary for good electromagnetic conversion characteristics
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 solution provides a magnetic recording medium with improved electromagnetic conversion characteristics and reduced friction coefficients, enhancing running stability and preventing sticking or scraping, while maintaining uniform film quality and recording density.
Implementation Method 1
a fluorine concentration A obtained by X-ray photoelectron spectroscopy performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees
Implementation Method 2
an integrated intensity Fupper of fragments derived from a fluorine compound obtained for a region from the surface of the magnetic layer to an intermediate thickness in the thickness direction of the cross section, is 60% or more and 95% or less, wherein B is calculated by Equation 1 from an integrated intensity Ftotal of fragments derived from a fluorine-containing compound obtained for an entire region in a thickness direction of a cross section of the magnetic layer by line profile analysis of time-of-flight secondary ion mass spectrometry (TOF-SIMS)
Data Source
AI summary
The magnetic recording medium has an arithmetic average roughness Ra of a surface of a magnetic layer is 2.2 nm or less, a fluorine concentration A obtained by X-ray photoelectron spectroscopy performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees being 5 atom % or more and 50 atom % or less, and B, which is calculated by Equation 1 from an integrated intensity Ftotal of fragments derived from a fluorine-containing compound obtained for an entire region in a thickness direction of a cross section of the magnetic layer by line profile analysis of TOF-SIMS and an integrated intensity Fupper of fragments derived from a fluorine compound obtained for a region from the surface of the magnetic layer to an intermediate thickness in the thickness direction of the cross section, being 60% or more and 95% or less, Equation 1:B=(Fupper/Ftotal)×100.