Magnetic Recording Medium Soft Underlayer Stiffness
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Solution Overview
Problem
Magnetic recording media face challenges in maintaining high tracking servo characteristics and signal-noise ratio (SNR) due to resonance phenomena caused by friction between the servo signal write head and the magnetic tape, leading to blurring and degradation of tracking servo characteristics.
Innovation Solution
A magnetic recording medium with a flexible substrate and a soft magnetic layer of average thickness between 10 nm and 50 nm, positioned between the substrate and the recording layer, which provides a Young's modulus difference of 2.4 GPa or more in the longitudinal direction, enhancing stiffness and preventing surface magnetization perpendicular to the film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the magnetic tape is made to run with extremely high positional accuracy to write the servo signal accurately, then the servo signal writing precision is improved, but friction between the servo signal write head and the magnetic tape causes resonance phenomenon leading to blurring and degradation of tracking servo characteristics
Solution Approach 1:
The patent introduces a soft magnetic underlayer with specific thickness (10-50 nm) and specific magnetic properties (coercive force of 0.5-5 kOe) to change the physical parameters of the magnetic recording medium. This parameter change reduces the resonance phenomenon by damping vibrations while maintaining the stiffness difference (Young's modulus difference of 2.4 GPa or more) between the magnetic tape and substrate, thereby resolving the contradiction between writing precision and tracking reliability
Solution Approach 2:
The patent creates a composite structure by adding a soft magnetic underlayer between the substrate and the magnetic recording layer. This composite material structure combines the stiffness of the substrate with the damping properties of the soft magnetic layer, achieving both high positional accuracy during writing and reliable tracking servo characteristics by suppressing resonance vibrations
2Reliability
If a soft magnetic layer with thickness of 10 nm to 50 nm is introduced to prevent surface magnetization perpendicular to the film, then tracking servo characteristics are improved, but the structural complexity increases
Solution Approach 1:
The patent optimizes the thickness parameter of the soft magnetic underlayer to a specific range (10-50 nm) to achieve the desired effect of preventing perpendicular surface magnetization and improving tracking servo characteristics. By carefully controlling this single parameter within a defined range, the patent improves reliability without requiring complex multi-layer structures or additional components
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
This configuration results in a magnetic recording medium with improved tracking servo characteristics and high SNR, enabling high areal recording densities and large-capacity data storage while maintaining effective contact with the magnetic head.
Implementation Method 1
a soft magnetic layer having an average thickness of 10 nm or more and 50 nm or less... in which the soft magnetic layer is disposed between the substrate and the recording layer
Implementation Method 2
a friction or the like between the servo signal write head and the magnetic tape causes a resonance phenomenon of vibration between the magnetic tape and a guide
Implementation Method 3
a friction or the like between the servo signal write head and the magnetic tape causes a resonance phenomenon of vibration
Implementation Method 4
a difference in Young's modulus between the magnetic recording medium and the substrate in a longitudinal direction of the substrate is 2.4 GPa or more
Data Source
AI summary
A magnetic recording medium includes a flexible and elongated substrate, a soft magnetic layer having an average thickness of 10 nm or more to 50 nm or less, and a recording layer. The soft magnetic layer is disposed between the substrate and the recording layer, and a difference in Young's modulus between the magnetic recording medium and the substrate in a longitudinal direction of the substrate is 2.4 GPa or more.