Magnetic Recording Medium Surface Smoothness
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Solution Overview
Problem
Magnetic recording media face a challenge in achieving high resolution, particularly at short recording wavelengths, which results in lower output. To address this, it is necessary to enhance the resolution of the magnetic recording medium to approach the output levels achieved at longer recording wavelengths.
Innovation Solution
A magnetic recording medium is developed with a magnetic layer and an underlayer, where the core part level difference Rk in the bearing curve is 5.5 nm or less, and the average thickness of the underlayer is 1.50 μm or less. This configuration improves the resolution by increasing the smoothness of the magnetic layer-side surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the recording wavelength is shortened to increase recording density, then the recording capacity is improved, but the output decreases
Solution Approach 1:
The patent applies fluid dynamics principles in the slurry preparation and coating processes, using controlled fluid flow to achieve uniform thin layer deposition with specific surface properties that enable high resolution at short wavelengths
Solution Approach 2:
The patent systematically optimizes multiple parameters including underlayer thickness (100-500 nm), magnetic layer thickness (50-200 nm), slurry composition ratios, and drying conditions to achieve the desired surface smoothness and magnetic properties for high-density recording
2Power
If the resolution is increased to improve output at short wavelengths, then the output approaches long-wavelength levels, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary surface preparation through the underlayer formation and controlled drying processes before magnetic layer deposition, creating a pre-conditioned surface that enables high resolution without requiring extreme manufacturing precision in subsequent steps
Solution Approach 2:
The patent introduces an underlayer as an intermediary between the substrate and magnetic layer, which mediates the surface properties to achieve the required smoothness (Ra ≤ 1.0 nm) and facilitates high-resolution recording
Data Source
AI summary
The present technology provides a magnetic recording medium of a tape form, including: a magnetic layer; and an underlayer, in which a core part level difference Rk is 5.5 nm or less in a bearing curve generated on the basis of height data of a magnetic layer-side surface acquired using an atomic force microscope, and an average thickness of the underlayer is 1.50 μm or less. In addition, the present technology also provides a tape cartridge including the magnetic recording medium of the tape form.