Magnetic Tape Surface C-H Concentration for Servo Accuracy
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Solution Overview
Problem
Magnetic tapes with a total thickness of the non-magnetic layer and magnetic layer equal to or smaller than 0.60 μm experience a decrease in servo signal output, leading to reduced head positioning accuracy in timing-based servo systems, which affects the correct recording and reproduction of data.
Innovation Solution
Incorporating a timing-based servo pattern in the magnetic layer with a surface C—H derived C concentration of at least 45 atom % calculated from X-ray photoelectron spectroscopic analysis, and including fatty acid or fatty acid amide components to enhance the sliding performance and prevent servo signal output decrease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the total thickness of the non-magnetic layer and magnetic layer is decreased to 0.60 μm or less to increase recording capacity, then the recording capacity is improved, but the servo signal output is reduced and head positioning accuracy deteriorates
Solution Approach 1:
The invention applies local quality by creating a lubricant-enriched surface layer specifically at the magnetic layer surface where the servo head contacts. The surface part C—H derived C concentration is set to 45 atom % or more, which is higher than the inner part, creating a localized lubricant-rich zone that improves sliding performance without increasing overall tape thickness. This localized modification resolves the contradiction by providing sufficient lubrication for accurate head positioning while maintaining the thin overall structure for high recording capacity.
Solution Approach 2:
The invention changes the chemical composition parameter of the magnetic layer surface by controlling the C—H derived C concentration to be 45 atom % or more. This parameter change reflects a higher concentration of lubricant components (fatty acid and/or fatty acid amide) at the surface. By adjusting this compositional parameter, the sliding performance is improved, preventing servo signal output reduction and maintaining head positioning accuracy even in the thinned magnetic tape structure.
2Quantity of substance
If the total thickness of the non-magnetic layer and magnetic layer is decreased to 0.60 μm or less to increase recording capacity, then the recording capacity is improved, but the sliding performance between the magnetic tape and servo write head deteriorates
Solution Approach 1:
The invention applies local quality by creating a lubricant-enriched surface layer specifically at the magnetic layer surface where the servo head contacts. The surface part C—H derived C concentration is set to 45 atom % or more, which is higher than the inner part, creating a localized lubricant-rich zone that improves sliding performance without increasing overall tape thickness. This localized modification resolves the contradiction by providing sufficient lubrication for accurate head positioning while maintaining the thin overall structure for high recording capacity.
Solution Approach 2:
The invention changes the chemical composition parameter of the magnetic layer surface by controlling the C—H derived C concentration to be 45 atom % or more. This parameter change reflects a higher concentration of lubricant components (fatty acid and/or fatty acid amide) at the surface. By adjusting this compositional parameter, the sliding performance is improved, preventing servo signal output reduction and maintaining head positioning accuracy even in the thinned magnetic tape structure.
3Force
If fatty acid and/or fatty acid amide is added to the magnetic layer to improve sliding performance, then the sliding performance is improved, but the manufacturing complexity increases
Solution Approach 1:
The invention changes the chemical composition parameter of the magnetic layer surface by controlling the C—H derived C concentration to be 45 atom % or more. This parameter change reflects a higher concentration of lubricant components (fatty acid and/or fatty acid amide) at the surface. By adjusting this compositional parameter, the sliding performance is improved, preventing servo signal output reduction and maintaining head positioning accuracy even in the thinned magnetic tape structure.
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 increased surface C—H derived C concentration improves the sliding between the magnetic tape and the servo write head, preventing shavings and maintaining servo signal integrity, thus maintaining accurate head positioning and data recording/reproduction in thin magnetic tapes.
Implementation Method 1
one or more components selected from the group consisting of fatty acid and fatty acid amide are at least included in the magnetic layer, and a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %
Data Source
AI summary
A magnetic tape includes a non-magnetic layer containing non-magnetic powder and a binder on a non-magnetic support; and a magnetic layer containing ferromagnetic powder and a binder on the non-magnetic layer. The total thickness of the non-magnetic layer and the magnetic layer is equal to or less than 0.60 μm. The magnetic layer includes a timing-based servo pattern. One or more components selected from a fatty acid and a fatty acid amide are included in at least the magnetic layer. The C—H derived C concentration calculated from the C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %.