Magnetic Recording Device Off-Track Margin
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Solution Overview
Problem
Magnetic recording devices face increased bit error rates due to displacement of the reproducing element from the center of the recording track, leading to poor off-track margin properties as recording density increases.
Innovation Solution
A magnetic recording and reproducing device is designed with an inductive recording element having a first and second magnetic pole with equal distal end widths, a reproducing element width of 0.8 μm or less, and a magnetic recording medium with specific distributions of bright and dark areas on its surface, optimized for improved off-track margin properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If recording density is increased to achieve high capacity, then recording capacity is improved, but bit error rate increases due to off-track displacement
Solution Approach 1:
The magnetic layer incorporates non-magnetic powder particles with specific size distributions (1-50 nm, 51-100 nm, and 101 nm or more) to create localized structural features. This local quality variation in the magnetic layer structure helps maintain stable magnetization states even when the reproducing element is slightly displaced from the track center, thereby improving off-track margin properties while preserving high recording capacity.
Solution Approach 2:
The invention changes the physical and chemical parameters of the magnetic layer by controlling the size distribution, content ratio, and surface characteristics of non-magnetic powder particles. These parameter changes create optimal magnetic properties that enhance both recording capacity and reproduction reliability, allowing the system to achieve high capacity without suffering from increased bit error rates due to off-track displacement.
2Manufacturing precision
If reproducing element width is reduced to improve resolution, then off-track margin is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention specifies precise parameter ranges for the reproducing element width (0.6-0.8 μm) and the distal end widths of magnetic poles (0.3-0.5 μm). By establishing these well-defined parameter specifications, the design balances the need for high off-track margin performance with practical manufacturability, avoiding excessive device complexity while achieving the required precision.
3Reliability
If distal end widths of magnetic poles are made equal to reduce distortion, then manufacturing precision requirements increase
Solution Approach 1:
The invention creates local quality variations in the magnetic layer through non-magnetic powder particles, which compensates for the need for perfectly uniform magnetic pole widths. The specific size distribution of non-magnetic particles (1-50 nm, 51-100 nm, and 101 nm or more) creates localized magnetic field stabilization that reduces distortion effects, allowing for practical manufacturing tolerances while maintaining reliable magnetization states.
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 off-track margin properties, reducing bit error rates and improving data reproduction quality in high-density recordings by maintaining a stable magnetization state and minimizing distortion at the recording track ends.
Implementation Method 1
a recording element which is an inductive recording element including a first magnetic pole which generates a magnetic field
Implementation Method 2
Reproduction of data is performed by magnetically reading the data recorded as described above using a reproducing element
Data Source
AI summary
In the magnetic recording and reproducing device, a distal end width of the first magnetic pole in the recording element is substantially the same as a distal end width of the second magnetic pole; the reproducing element width of the reproducing element is equal to or less than 0.8 μm; and in the magnetic recording medium, a number distribution A of equivalent circle diameters of a plurality of bright areas in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer with a scanning electron microscope at an acceleration voltage of 5 kV, and a number distribution B of equivalent circle diameters of a plurality of dark areas in a binarized image of a secondary electron image obtained by imaging the surface of the magnetic layer with a scanning electron microscope at an acceleration voltage of 2 kV satisfy predetermined number distribution, respectively.