Tape-Shaped Magnetic Recording Medium With Thin Layer
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Solution Overview
Problem
Current magnetic recording technologies face challenges in achieving high-density data recording due to limitations in recording density and signal accuracy, particularly in maintaining precise alignment and tracking of data signals.
Innovation Solution
A tape-shaped magnetic recording medium with a magnetic layer having a high degree of perpendicular orientation, a thin thickness, and specific dimensions, including a data band and servo band configuration, which enhances data signal sharpness and alignment, allowing for improved recording density and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If perpendicular magnetic recording method is used, then recording density is improved, but signal sharpness and tracking precision deteriorate
Solution Approach 1:
The patent changes the degree of perpendicular orientation parameter from conventional values to specifically 65% or more, which fundamentally alters the magnetic layer's magnetic domain structure. This parameter change enables the magnetic layers to maintain sharper reproduced waveforms while achieving high recording density through perpendicular magnetization, thereby resolving the contradiction between recording density and tracking precision
Solution Approach 2:
The patent employs a composite magnetic layer structure consisting of multiple layers with different functions: a base magnetic layer for data storage, an intermediate layer for magnetic coupling, and a protective layer. This composite structure maintains signal sharpness while enabling high-density perpendicular recording, thus resolving the contradiction between recording density and waveform quality
2Quantity of substance
If magnetic layer thickness is reduced, then recording density is improved, but signal strength and reliability deteriorate
Solution Approach 1:
The patent optimizes the magnetic layer thickness parameter to a specific range (30-90 nm) that balances areal density and signal strength. Within this range, the perpendicular magnetic anisotropy is sufficiently strong to maintain stable magnetic domains for high-density recording, while the thickness remains adequate to provide sufficient signal strength for reliable readback
Solution Approach 2:
The patent uses a composite magnetic layer structure where multiple thin magnetic sub-layers are stacked with intermediate coupling layers. This composite approach achieves high areal density through thin total thickness while the cumulative magnetic moment of multiple layers provides sufficient signal strength, resolving the contradiction between recording density and signal reliability
3Quantity of substance
If base material thickness is reduced, then overall recording capacity is improved, but mechanical strength and durability deteriorate
Solution Approach 1:
The patent reduces the base material thickness parameter to 4.2 μm or less, which increases the proportion of usable magnetic recording layers relative to the total tape thickness. This parameter change maximizes recording capacity while the base material is engineered with sufficient mechanical properties to maintain durability at the reduced thickness
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 significantly improves data recording density and signal accuracy by sharpening the peak of the reproduced waveform, enabling more precise tracking and higher data capacity.
Implementation Method 1
a perpendicular magnetic recording method in which magnetic particles in the magnetic layer are magnetized in a perpendicular direction to record data
Implementation Method 2
A magnetic head reads the servo signal recorded on the servo band, and is aligned with respect to the recording track by using the read servo signal
Data Source
AI summary
A magnetic recording medium according to the present technology is a tape-shaped magnetic recording medium including: a base material; and a magnetic layer, the tape-shaped magnetic recording medium being long in a longitudinal direction and short in a width direction, in which the magnetic layer includes a data band long in the longitudinal direction and a servo band long in the longitudinal direction, a data signal being written to the data band, a servo signal being written to the servo band, the degree of perpendicular orientation of the magnetic layer being 65% or more, a full width at half maximum of an isolated waveform in a reproduced waveform of the data signal is 185 nm or less, a thickness of the magnetic layer is 90 nm or less, and a thickness of the base material is 4.2 μm or less.