Perpendicular Write Head with Independent Trailing and Side Shield Throat Heights
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Solution Overview
Problem
Perpendicular magnetic recording systems face challenges in independently controlling magnetic potential between the write pole and trailing and side shields, which is crucial for optimizing areal density and track density, but existing wrap-around shields with a single throat height constrain system design and manufacturing complexity.
Innovation Solution
The write head design features independently configured trailing and side shields with different throat heights, allowing for separate magnetic connections and independent control of magnetic potential, enabling tapered throat heights and reduced manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wrap-around shields with single throat height are used, then manufacturing is simplified, but independent control of magnetic potential between write pole and shields is constrained
Solution Approach 1:
The shield structure is divided into separate trailing shield and side shield components, each with independent throat heights. This segmentation allows independent control of magnetic potential between the write pole and each shield, while maintaining manufacturing simplicity through modular construction.
Solution Approach 2:
Different throat heights are assigned to different regions of the shield structure - the trailing shield has one throat height while the side shields have another. This local differentiation enables independent magnetic potential control in different spatial zones without complicating the overall manufacturing process.
2Adaptability or versatility
If trailing and side shields are independently configured with different throat heights, then independent control of magnetic potential is achieved, but device complexity increases
Solution Approach 1:
By segmenting the shield into trailing and side components with different throat heights, the patent achieves independent magnetic potential control. The segmentation is implemented through separate fabrication and assembly, which manages complexity through modularity rather than monolithic design.
Solution Approach 2:
The shield structure serves multiple functions: it provides magnetic shielding, defines throat heights for independent potential control, and maintains mechanical integrity. This multi-functionality reduces the need for additional components, thereby managing device complexity while achieving independent control.
3Device complexity
If single throat height shield is used, then device complexity is reduced, but control over field gradients and track density is limited
Solution Approach 1:
The patent applies different throat heights to different spatial regions of the shield structure, creating local variations in magnetic field distribution. This local quality differentiation enables precise control over field gradients and track density in specific zones without requiring complex overall shield design.
Solution Approach 2:
By varying the throat height parameter across different shield regions, the patent achieves control over field gradients and track density. The parameter change from uniform to varied throat heights enables precision control while maintaining relatively simple shield structures.
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 design allows for independent adjustment of magnetostatic potentials between the write pole and shields, enhancing field gradients and track density without scaling issues, thereby increasing areal density and reducing side erasure fields.
Implementation Method 1
A strong, highly concentrated magnetic field emits from the write pole in a direction substantially perpendicular to the magnetic disk surface, magnetizing the magnetically hard top layer
Implementation Method 2
The resulting magnetic flux then travels through the soft underlayer, returning to the return pole where it is sufficiently spread out and weak
Implementation Method 3
a spin valve sensor, also referred to as a giant magnetoresistive (GMR) sensor, has been employed for sensing magnetic fields from the rotating magnetic disk
Implementation Method 4
a portion of the conduction electrons is scattered by the interfaces of the spacer layer with each of the pinned and free layers
Data Source
AI summary
A magnetic write head having independent trailing and side magnetic shields. The side shields and trailing shields are independently of one another so that they can have throat heights that are different from one another. This advantageously allows the magnetic potential between the write pole and side shields to be controlled independently of one another without relying on the side gap and trailing gap thicknesses. Furthermore, magnetic performance of the write head can be improved because the side shields can be constructed with varying tapered throat heights, while the throat height of the trailing shield can remain constant.