Magnetic Recording Medium Thermal Stability
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Solution Overview
Problem
Magnetic recording media face challenges in achieving high thermal stability while maintaining small particle volumes of magnetic powder, which are necessary for enhanced recording density and electromagnetic conversion characteristics.
Innovation Solution
A tape-shaped magnetic recording medium with a magnetic layer having a specific thickness, aspect ratio, and coercive forces, including a substrate, magnetic powder with controlled particle volume, and additional layers like a ground layer and back layer, optimized for thermal stability and electromagnetic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the particle volume of the magnetic powder is reduced to enhance recording density and electromagnetic conversion characteristics, then the recording density and electromagnetic conversion characteristics are improved, but the thermal stability of the magnetic recording medium is worsened
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle volume of magnetic powder within the range of 0.01 to 0.5 μm³ and the average particle size between 5 to 20 nm. By optimizing these physical parameters, the invention achieves high recording density with small particles while preventing thermal instability that would occur with excessively small particles. This parameter optimization resolves the contradiction between improving recording density and maintaining thermal stability.
Solution Approach 2:
The patent employs composite materials by combining magnetic powder particles with specific size and volume characteristics with a magnetic layer structure. The controlled composition and size distribution of the magnetic powder within the magnetic layer create a composite structure that maintains both high recording density and adequate thermal stability, resolving the contradiction between these two opposing requirements.
2Power
If the particle volume of the magnetic powder is reduced to enhance electromagnetic conversion characteristics, then the electromagnetic conversion characteristics are improved, but the thermal stability of the magnetic recording medium is worsened
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle volume of magnetic powder within the range of 0.01 to 0.5 μm³ and the average particle size between 5 to 20 nm. By optimizing these physical parameters, the invention achieves high recording density with small particles while preventing thermal instability that would occur with excessively small particles. This parameter optimization resolves the contradiction between improving recording density and maintaining thermal 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 solution enhances both thermal stability and electromagnetic conversion characteristics, preventing signal attenuation during long-term storage and improving recording capacity.
Implementation Method 1
As the particle volume of the magnetic powder becomes smaller, thermal stability of the magnetic recording medium is worsened
Implementation Method 2
for enhancing electro-magnetic conversion characteristics, also, it may be considered to reduce the particle volume of the magnetic powder
Implementation Method 3
In order to enhance recording density on a magnetic recording medium, it may be contemplated to reduce the particle volume of the magnetic powder included in the magnetic recording medium
Data Source
AI summary
An object of the present disclosure is to provide a magnetic recording medium excellent in electro-magnetic conversion characteristic and thermal stability.The present disclosure provides a tape-shaped magnetic recording medium including: a substrate; and a magnetic layer provided over the substrate and including a magnetic powder, in which the magnetic layer has an average thickness of equal to or less than 90 nm, the magnetic powder has an average aspect ratio of from 1.0 to 3.0, the magnetic powder has an average particle volume of equal to or less than 2,300 nm3, a coercive force Hc1 in a vertical direction of the magnetic recording medium is equal to or less than 4,500 Oe, a coercive force Hc2 in a longitudinal direction of the magnetic recording medium and the coercive force Hc1 satisfy a relation of Hc2/Hc1≤0.8, and the ratio Hrp/Hc1 of a residual coercive force Hrp of the magnetic recording medium measured using a pulsed magnetic field and the coercive force Hc1 is equal to or less than 2.0.