Magnetic Head Distance Adjustment for Thermally Assisted Recording
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Solution Overview
Problem
Magnetic disk devices with thermally assisted magnetic recording using near-field light face challenges in maintaining high writing quality due to manufacturing errors and variations in coercivity, leading to suboptimal temperature gradient distribution, which affects the application of the magnetic field during data writing.
Innovation Solution
A magnetic head with a piezo element unit that adjusts the distance between the magnetic pole and the near-field light generating unit, allowing for precise alignment of the magnetic field at the steepest temperature gradient on the magnetic disk, thereby improving writing quality by optimizing the signal-to-noise ratio and bit error rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the distance between the magnetic pole and the near-field light generating unit is fixed according to design specifications, then the device structure is simple, but manufacturing errors cause misalignment between the magnetic field application position and the steepest temperature gradient position
Solution Approach 1:
The magnetic pole is made movable relative to the near-field light generating unit through a positioning mechanism. The magnetic pole can be adjusted in the traveling direction of the magnetic head to change its distance from the light generating unit, allowing dynamic alignment compensation for manufacturing errors and variations in coercivity.
Solution Approach 2:
The distance parameter between the magnetic pole and the near-field light generating unit is made variable rather than fixed. By adjusting this distance parameter, the system can optimize the alignment between the magnetic field application position and the steepest temperature gradient position on the magnetic disk surface.
2Reliability
If the distance between the magnetic pole and the near-field light generating unit is adjusted to compensate for manufacturing errors, then writing quality is improved, but the device structure becomes more complex
Solution Approach 1:
A positioning mechanism is introduced that allows the magnetic pole to move in the traveling direction of the magnetic head. This dynamic adjustment capability enables compensation for manufacturing errors and variations in coercivity, improving writing quality and reducing bit error rates.
Solution Approach 2:
The system includes a positioning mechanism that can be adjusted based on feedback from writing quality measurements. The device performs self-adjustment to optimize the distance between the magnetic pole and light generating unit, improving reliability without requiring external intervention for each adjustment.
3Ease of manufacture
If a fixed distance is used between the magnetic pole and the near-field light generating unit, then the device is easier to manufacture, but the temperature gradient distribution is suboptimal affecting magnetic field application
Solution Approach 1:
The magnetic pole is equipped with a positioning mechanism that allows adjustment in the traveling direction of the magnetic head. This enables optimization of the temperature gradient distribution by adjusting the distance between the magnetic pole and light generating unit, while maintaining relatively simple manufacturing processes.
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 adjustment of the magnetic pole's position relative to the near-field light generating unit enhances the writing quality by ensuring the magnetic field is applied at the steepest temperature gradient, resulting in improved signal-to-noise ratio and reduced bit error rates during data writing.
Implementation Method 1
a piezo element unit that adjusts a distance between the magnetic pole and the near-field light generating unit
Implementation Method 2
the magnetic head includes: a near-field light generating element that generates near-field light... Upon writing data to the magnetic disk, such a device temporarily and locally heats up the magnetic disk by the near-field light generated by the near-field light generating element
Implementation Method 3
the magnetic head includes... a magnetic pole for writing data to a magnetic disk
Data Source
AI summary
According to one embodiment, a magnetic head is arranged opposite a magnetic recording medium including a recording layer. The magnetic head includes a magnetic pole, a light emitting unit, and a distance adjusting unit. The magnetic pole includes a soft magnetic material. The light emitting unit is arranged with respect to the magnetic pole in a travel direction of the magnetic head, and emits light with respect to the recording layer. The distance adjusting unit adjusts a distance between the magnetic pole and the light emitting unit.