Recording Head Dimensions for Servo Layer Writing
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Solution Overview
Problem
Conventional magnetic recording media face challenges in writing servo information without overwriting it due to the servo layer being affected by the writing field, requiring a high nucleation field and energy-assisted writing, which is complex and not readily available.
Innovation Solution
A device and method involving a media with a servo layer and a data recording layer, where the servo layer is positioned below the data recording layer, and a recording head with larger dimensions to produce a stronger magnetic writing field, allowing for effective writing on the servo layer without energy-assisted writing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the servo layer is placed below the data recording layer, then the servo information can be protected from overwriting by the writing field, but the head field decay to the servo layer becomes larger making it difficult to write servo information
Solution Approach 1:
The servo information is written onto the servo layer before the data recording layer is deposited. This preliminary action ensures that the servo information is already in place and protected when the data layer is subsequently written, eliminating the risk of overwriting while allowing the use of a larger recording head for data writing
2Device complexity
If a conventional recording/writing head is used, then the device complexity is low, but it cannot write servo information onto the servo layer without energy assisted writing
Solution Approach 1:
The patent changes the physical parameters of the recording head by increasing its dimensions (larger width and/or length) to produce a stronger magnetic writing field. This parameter change enables the head to write onto the high coercivity servo layer without requiring energy assisted writing, while keeping the head design simple and readily available
3Reliability
If the switching field of the servo layer is made large, then the servo layer is harder to write on and protected from overwriting, but it becomes more difficult to write servo information without energy assisted writing
Solution Approach 1:
The patent changes the parameter of the recording head (its dimensions) to produce a stronger magnetic field that can overcome the high switching field of the servo layer. This allows the servo layer to maintain its high coercivity for protection while being writable with a simple, non-energy-assisted head design
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
Enables continuous servo readback for accurate location detection, increases data recording density, and avoids overwriting servo information, with the recording head being more readily available and easily designed.
Implementation Method 1
a recording head including a dimension sized to produce a magnetic writing field to write servo information on the servo layer
Data Source
AI summary
A device may be provided. The device includes a media including a servo layer and a data recording layer, and a recording head including a dimension sized to produce a magnetic writing field to write servo information on the servo layer.