Magnetic Recording Head Flux Control Layer
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Solution Overview
Problem
The challenge in magnetic recording technology is achieving higher recording density while maintaining a sufficient magnetic field magnitude, as increasing coercivity of the recording medium requires a stronger writing magnetic field, which is compromised by narrowing the writing gap, leading to decreased magnetic field magnitude and resolution.
Innovation Solution
Incorporating a magnetic flux control layer within the writing gap of the recording head, comprising multiple metal layers, to manage magnetic flux and enhance the magnetic field magnitude applied to the recording medium, thereby allowing for higher recording density without reducing the magnetic field strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the writing gap length is made smaller to improve recording density, then the magnetic field magnitude decreases
Solution Approach 1:
A magnetic flux control layer is introduced as an intermediary component within the writing gap. This layer mediates between the main magnetic pole and the recording medium, shaping and concentrating the magnetic flux to maintain sufficient magnetic field magnitude even when the writing gap is narrowed for higher recording density
Solution Approach 2:
The magnetic flux control layer changes the magnetic field distribution parameters by controlling flux concentration and direction. By adjusting the properties of this control layer, the magnetic field magnitude is maintained while enabling narrower writing gap for higher density
2Strength
If the writing gap length is made larger to increase magnetic field magnitude, then writing resolution decreases
Solution Approach 1:
The magnetic flux control layer acts as a mediator that allows the writing gap to be narrowed without sacrificing magnetic field magnitude. This intermediary enables the system to operate at smaller gap lengths while maintaining sufficient field strength for high-resolution writing
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 magnetic flux control layer effectively reduces magnetic flux leakage, enabling efficient application of the recording magnetic field, thus maintaining high recording density and magnetic field magnitude even with a narrowed writing gap, improving recording resolution and density.
Implementation Method 1
a magnetic flux control layer disposed inside the write gap between the main magnetic pole and the writing shield
Implementation Method 2
The magnetic flux control layer effectively reduces magnetic flux leakage
Data Source
AI summary
A magnetic recording apparatus includes a disk-shaped recording medium with a magnetic recording layer, and a recording head that magnetically writes data onto the magnetic recording layer and includes a main magnetic pole, a write shield facing the main magnetic pole and positioned with a writing gap disposed between the main magnetic pole and the write shield, and a magnetic flux control layer disposed inside the write gap between the main magnetic pole and the writing shield. The magnetic flux control layer includes a first layer including a first metal and contacting one of the main magnetic pole and the writing shield, a second control layer, and a third layer including a second metal and contacting the other one of the main magnetic pole and the writing shield. The second control layer includes a magnetic metal and contacts the first layer and the third layer.