Magnetic Tape Hexagonal Ferrite Surface C-H Concentration
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Solution Overview
Problem
Magnetic tapes with ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm3 experience a partial output decrease during signal reproduction, leading to increased error rates and reduced reliability due to decreased abrasion resistance and signal amplitude.
Innovation Solution
A magnetic tape with a magnetic layer containing ferromagnetic hexagonal ferrite powder, fatty acid or fatty acid amide, and an abrasive, where the surface C—H derived C concentration is greater than 45 atom % and the tilt angle of the ferromagnetic hexagonal ferrite powder is between 0.85 and 1.00, enhancing abrasion resistance and preventing partial output decrease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If ferromagnetic hexagonal ferrite powder with activation volume ≤1,600 nm³ is used in the magnetic layer, then high-density recording is achieved, but partial output decrease occurs during signal reproduction
Solution Approach 1:
The patent applies parameter changes by controlling the C—H derived C concentration on the magnetic layer surface to be 45-80 atom% and the tilt angle of ferromagnetic hexagonal ferrite powder to be 0.85-1.00. These parameter optimizations prevent partial output decrease while maintaining high-density recording capability with activation volume ≤1,600 nm³
Solution Approach 2:
The patent implements local quality by creating a specific surface composition distribution with controlled C—H derived C concentration (45-80 atom%) on the magnetic layer surface. This localized compositional control improves signal reproduction stability without compromising the overall high-density recording performance
2Quantity of substance
If ferromagnetic hexagonal ferrite powder with activation volume ≤1,600 nm³ is used in the magnetic layer, then recording density is increased, but abrasion resistance decreases
Solution Approach 1:
The patent uses parameter changes by optimizing the tilt angle of ferromagnetic hexagonal ferrite powder to 0.85-1.00 and C—H derived C concentration to 45-80 atom%. These parameter adjustments enhance abrasion resistance while preserving the high-density recording benefits of fine particle size
Solution Approach 2:
The patent applies composite materials by combining ferromagnetic hexagonal ferrite powder with a binder and controlling surface composition to achieve both high-density recording and improved abrasion resistance. The composite structure allows fine particles to be protected within the magnetic layer matrix
3Quantity of substance
If ferromagnetic hexagonal ferrite powder with activation volume ≤1,600 nm³ is used in the magnetic layer, then micronization is achieved, but error rate increases due to partial output decrease
Solution Approach 1:
The patent applies parameter changes by controlling the tilt angle of ferromagnetic hexagonal ferrite powder to 0.85-1.00 and C—H derived C concentration to 45-80 atom%. These parameter optimizations eliminate partial output decrease, thereby preventing error rate increases while maintaining micronization for high-density recording
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 effectively prevents partial output decrease during signal reproduction, maintaining high signal amplitude and reducing error rates by ensuring smooth sliding between the magnetic layer and the head, thus improving the reliability and stability of the magnetic tape.
Implementation Method 1
the ferromagnetic powder is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm3
Implementation Method 2
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
Data Source
AI summary
A magnetic tape is provided in which ferromagnetic powder included in a magnetic layer is ferromagnetic hexagonal ferrite powder having an activation volume less than or equal to 1,600 nm3. The magnetic layer includes one or more components selected from a fatty acid and a fatty acid amide, and an abrasive. 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 greater than or equal to 45 atom %. Also, the tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to the surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00.