Magnetic Recording Substrate Lattice Alignment
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Solution Overview
Problem
In magnetic recording media, irregular formation of the unit lattice in the magnetic layer leads to distortion, non-magnetic areas, and deteriorated magnetic properties, particularly at high recording densities, causing write and read errors due to side fringing and signal noise.
Innovation Solution
A magnetic recording medium substrate with recording areas on a disk-shaped surface, where the dimensions of these areas are an integral multiple of the lattice constant of the single crystal structure, and grooves are formed to accommodate these areas, ensuring regular magnetic layer formation and reducing distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high-density vertical recording is implemented, then recording density is improved, but side fringing causes adjacent track magnetization leading to write and read errors
Solution Approach 1:
The disk surface is segmented into discrete track regions separated by non-magnetic areas. Each recording area is defined with specific dimensions that are integral multiples of the lattice constant, creating physically separated tracks that prevent magnetic interference between adjacent tracks while maintaining high recording density.
2Ease of manufacture
If recording areas are formed with irregular unit lattice formation, then manufacturing flexibility is improved, but magnetic layer distortion occurs leading to non-magnetic areas and deteriorated magnetic properties
Solution Approach 1:
The dimensions of recording areas are specifically controlled to be integral multiples of the lattice constant of the single crystal structure. This parameter control ensures that unit lattices form regularly throughout the magnetic layer, preventing distortion and maintaining desired magnetic properties including coercive force and reproduction output.
3Reliability
If non-magnetic areas are added between tracks to prevent side fringing, then write and read accuracy is improved, but recording area is reduced
Solution Approach 1:
The disk surface is divided into regions with different magnetic properties: recording areas with specific dimensions that promote regular lattice formation, and non-magnetic areas that prevent track interference. This local differentiation optimizes both reliability and recording capacity by placing each type of area where it is most needed.
Data Source
AI summary
Provided are a magnetic recording medium substrate whereupon a magnetic layer can be regularly formed in a recording area, a magnetic recording medium and a method for manufacturing the magnetic recording medium substrate. A plurality of recording areas wherein the magnetic layer is to be formed are formed on the surface of the disk-shaped magnetic recording medium substrate. The size of the recording area is an integral multiple of a lattice constant of a unit lattice of a single crystal structure constituting the magnetic layer. For instance, the width of a protruding section (3) to be used as the recording area is an integral multiple of the lattice constant of the unit lattice of the single crystal structure configuring the magnetic layer.