Thin Magnetic Recording Medium for High-Density Storage
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Solution Overview
Problem
Magnetic recording media with thin thicknesses exhibit inferior traveling stability, particularly during repetitive recording and/or reproducing, due to changes in surface condition related to friction, which affects data storage capacity and quality.
Innovation Solution
A tape-like magnetic recording medium with a base containing polyester and a magnetic layer composed of magnetic powders, a binder, and a lubricant, where the average thickness is 5.6 μm or less, and the magnetic layer has an average thickness of 90 nm or less, ensuring favorable traveling stability and high-density recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the entire thickness of the magnetic recording medium is reduced to increase storage capacity, then the storage capacity per cartridge is improved, but the traveling stability deteriorates due to changes in surface friction condition
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness parameters of the magnetic recording medium (entire thickness ≤5.6 μm, base thickness ≤4.2 μm, magnetic layer thickness ≤90 nm) and the specific surface area (≥2.5 m²/g) to resolve the contradiction between reducing thickness for higher storage capacity and maintaining traveling stability. This quantitative parameter optimization allows the thin medium to achieve both high storage density and acceptable traveling performance.
Solution Approach 2:
The patent uses composite materials by combining polyester base material with specifically formulated magnetic layer materials including magnetic powders, binders, and lubricants. This composite structure enables the thin magnetic recording medium to maintain structural integrity and stable surface friction characteristics despite the reduced overall thickness, thereby achieving both high storage capacity and reliable traveling stability.
2Length of moving object
If the thickness of the magnetic recording medium is reduced, then the length of the magnetic recording medium per cartridge is increased, but the surface condition changes leading to deterioration of traveling stability
Solution Approach 1:
The patent resolves this contradiction by optimizing the thickness parameters (entire thickness ≤5.6 μm, base thickness ≤4.2 μm, magnetic layer thickness ≤90 nm) to enable increased tape length per cartridge while maintaining traveling stability through controlled surface friction characteristics achieved by the specific composite material formulation.
Solution Approach 2:
The patent employs thin film technology with a base thickness of ≤4.2 μm and magnetic layer thickness of ≤90 nm to create a flexible yet stable magnetic recording medium that can be accommodated in greater lengths per cartridge while maintaining sufficient mechanical strength and surface stability for reliable traveling.
3Manufacturing precision
If the magnetic recording medium has a thin entire thickness, then high-density recording is enabled, but the surface friction condition changes during repetitive recording and reproducing
Solution Approach 1:
The patent uses composite materials with a polyester base and a magnetic layer containing magnetic powders, binders, and lubricants to achieve high recording density with thin thickness (≤5.6 μm) while the lubricant component specifically addresses surface friction stability during repetitive recording and reproducing operations.
Solution Approach 2:
The patent applies parameter changes by controlling the magnetic layer thickness to ≤90 nm and the entire thickness to ≤5.6 μm to enable high-density recording, while simultaneously optimizing the specific surface area (≥2.5 m²/g) and material composition to maintain stable surface friction conditions during repetitive operations.
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 maintains favorable traveling stability and supports high-density recording while minimizing changes in surface friction, thereby enhancing data storage capacity and quality.
Implementation Method 1
perpendicular magnetic recording records data by magnetizing the magnetic particles in the magnetic layer in a perpendicular direction
Implementation Method 2
The magnetic layer includes a lubricant
Data Source
AI summary
Provided is a magnetic recording medium configured to achieve higher density recording. The magnetic recording medium has a tape-like shape, and includes: a base containing polyester as a main constituent; and a magnetic layer provided on the base, including a plurality of magnetic powders, and configured to record a data signal. An average thickness of the magnetic recording medium is 5.6 μm or less. An average thickness of the base is 4.2 μm or less. An average thickness of the magnetic layer is 90 nm or less. An average aspect ratio of the magnetic powders is 1.0 or greater and 3.0 or less. A coercivity in a perpendicular direction is 3000 oersted or less. A rate of a coercivity in a longitudinal direction to the coercivity in the perpendicular direction is 0.8 or less. The magnetic layer includes a lubricant. An entire BET specific surface area of the magnetic recording medium from which the lubricant has been removed is 2.5 m2/g or greater.