Magnetic Recording Medium Abrasive Dispersion for Head Wear
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Solution Overview
Problem
Magnetic recording media face challenges in achieving both good electromagnetic characteristics and running stability while maintaining running durability, as extremely fine abrasive particles can lead to head abrasion and decreased signal-to-noise ratio (SNR) due to inadequate polishing capability.
Innovation Solution
Incorporating ferromagnetic hexagonal ferrite powder with 3-12 weight percent Al into the magnetic layer, along with extremely fine abrasive particles, enhances running durability and stability by improving film strength and polishing capability, and using an aromatic hydrocarbon compound with phenolic hydroxyl groups for dispersion stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If extremely fine abrasive particles are incorporated into the magnetic layer to enhance electromagnetic characteristics, then electromagnetic characteristics are improved, but running durability decreases due to inadequate polishing capability and head abrasion
Solution Approach 1:
The patent employs a composite abrasive system consisting of two distinct types of abrasive particles with different characteristics. The first abrasive particles have a specific surface area of 5-20 m²/g and provide polishing capability, while the second abrasive particles have a specific surface area of 1-5 m²/g and contribute to running durability. This composite approach allows the magnetic layer to simultaneously achieve good electromagnetic characteristics and maintain running durability through coordinated polishing action.
2Reliability
If conventional abrasive particles are used to maintain running durability, then running durability is maintained, but electromagnetic characteristics are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the specific surface area of abrasive particles within defined ranges (5-20 m²/g for first abrasive, 1-5 m²/g for second abrasive). By optimizing these physical parameters, the abrasive particles achieve both adequate polishing capability for running durability and sufficiently fine particle size for improved electromagnetic characteristics, resolving the trade-off between the two requirements.
3Reliability
If abrasive particles are present in the magnetic layer to provide polishing capability, then running durability is enhanced, but head abrasion increases and running stability decreases
Solution Approach 1:
The patent applies local quality by creating a magnetic layer with non-uniform abrasive distribution and utilizing abrasive particles of different sizes for different functions. The first abrasive particles (5-20 m²/g) are optimized for polishing capability to prevent head grime accumulation, while the second abrasive particles (1-5 m²/g) are optimized for reducing head abrasion. This localized functional differentiation within the magnetic layer allows simultaneous achievement of running durability and running stability.
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 magnetic recording medium achieves improved electromagnetic characteristics, running durability, and stability by ensuring the abrasive particles are dispersed as extremely fine particles, preventing head abrasion and maintaining high SNR, making it suitable for high-capacity data backup tapes.
Implementation Method 1
the ferromagnetic powder is ferromagnetic hexagonal ferrite powder comprising 3 weight percent to 12 weight percent of Al
Implementation Method 2
an aromatic hydrocarbon compound comprising at least one phenolic hydroxyl group
Data Source
AI summary
An aspect of the present invention relates to a magnetic recording medium, which comprises a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder comprising 3 to 12 weight percent of Al, based on Al2O3 conversion, relative to 100 weight percent of a total weight of the powder, the magnetic layer further comprises abrasive, and a maximum plan view surface area of the abrasive as determined for a 4.3 μm×6.3 μm rectangular region of the magnetic layer by a scanning electron microscope is less than 0.06 percent relative to 100 percent of a total surface area of the region.