Magnetic Recording Medium Thermal Stability
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Solution Overview
Problem
Magnetic recording media face challenges in achieving both high thermal stability and electromagnetic conversion characteristics due to the miniaturization of magnetic powder, which leads to increased noise and decreased data signal stability.
Innovation Solution
A magnetic recording medium with a specific layer structure, including a magnetic layer with a particular average particle volume and magnetic interaction ΔM within the range of −0.362≤ΔM≤−0.22, utilizing a perpendicular orientation of magnetic powder, and a base layer of polyethylene terephthalate or polyethylene naphthalate, to optimize thermal stability and electromagnetic conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If magnetic powder is miniaturized to increase recording density, then recording density is improved, but thermal stability deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the average particle volume of magnetic powder (2300 nm³ or less) and the magnetic interaction parameter ΔM (−0.362≤ΔM≤−0.22) to achieve both high recording density and adequate thermal stability. This quantitative control of physical parameters resolves the contradiction between miniaturization benefits and stability requirements.
Solution Approach 2:
The patent uses composite materials by combining magnetic powder with specific binders and additives in a multi-layer structure (base layer, magnetic layer, foundation layer). This composite approach allows optimization of both the magnetic properties for density and the structural properties for thermal stability.
2Productivity
If magnetic powder is miniaturized to increase recording density, then recording density is improved, but electromagnetic conversion characteristic deteriorates
Solution Approach 1:
The patent controls the average particle volume (2300 nm³ or less) and magnetic interaction parameter ΔM within specific ranges to optimize the balance between recording density and electromagnetic conversion characteristics. This parameter optimization ensures that miniaturization does not compromise signal quality.
Solution Approach 2:
The patent introduces perpendicular orientation of magnetic powder particles, adding a dimensional aspect to particle arrangement. This perpendicular orientation enables better electromagnetic coupling while maintaining high density, resolving the contradiction through spatial reconfiguration.
3Length of stationary object
If magnetic layer thickness is reduced to decrease media thickness, then media thickness is improved, but thermal stability deteriorates
Solution Approach 1:
The patent controls the average thickness of the magnetic layer (80 nm or less) while simultaneously optimizing the particle volume and magnetic interaction parameters to maintain thermal stability despite the reduced thickness. This multi-parameter optimization allows thin media without sacrificing stability.
Solution Approach 2:
The patent employs a composite structure with base layer, magnetic layer, and foundation layer, where each layer is optimized for specific functions. This composite design enables thin overall media thickness while the base and foundation layers provide structural support for 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, allowing for improved data preservation and recording density while maintaining low noise levels.
Implementation Method 1
a magnetic interaction ΔM calculated by the following expression (1) of the magnetic layer is −0.362≤ΔM≤−0.22
Implementation Method 2
The magnetic powder may be subjected to a perpendicular orientation
Data Source
AI summary
An object is to further improve a thermal stability and an electromagnetic conversion characteristic of a magnetic recording medium.The present technology provides a magnetic recording medium that includes a layer structure including: a base layer; and a magnetic layer provided on the base layer and including a magnetic powder, in which an average particle volume of the magnetic powder is 2300 nm3 or less, and a magnetic interaction ΔM calculated by the following expression (1) of the magnetic layer is −0.362≤ΔM≤−0.22,ΔM={Id(H)+2Ir(H)−Ir(∞)}/Ir(∞) (1)[where, in the expression (1), Id(H) is a remanent magnetization measured by a direct-current demagnetization, Ir(H) is a remanent magnetization measured by an alternating-current demagnetization, and Ir(∞) is a remanent magnetization measured by an applied magnetic field of 6 kOe].